GB2566950A

GB2566950A - Lighting apparatus

Info

Publication number: GB2566950A
Application number: GB1715636.5A
Authority: GB
Inventors: Grant Alan
Original assignee: DW Windsor Ltd
Current assignee: DW Windsor Ltd
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2019-04-03
Anticipated expiration: 2037-09-27
Also published as: GB2566950B; GB201715636D0

Abstract

A railway platform lighting apparatus has a white light source 103,203, a movement detector 101,201, and a blue light source 105 which is activated when movement is detected on the platform 250 within a first range of the movement detector. The apparatus may help reduce the number of suicide incidences on railway platforms whilst minimizing phototoxic side-effects of blue light. The white light source may be a number of white light sources 200 spaced at intervals along the platform, activated when movement is detected within a larger second range of the movement detector and/or when a train a approaches the platform. The blue light may be activated in response to movement near the platform edge and/or within 5m of the end of the platform, and emit a wavelength between 450 to 495nm. The movement detector may have a PIR sensor. The light sources may each have a controller coupled to the same movement detector, or they may each have their own detector. A method of illuminating a railway platform is also claimed, which may be carried out by a computer program.

Description

Lighting apparatus

Field of the invention

The present disclosure relates to a lighting apparatus and lighting system, in particular a lighting apparatus and lighting system for a railway platform. The present disclosure also relates to a method of illuminating a railway platform and a method of installing a railway platform lighting system.

Background

White coloured LEDs are a very efficient and robust light source that are far more energy efficient than discharge and tungsten light sources. White coloured LEDs have been growing in popularity for some years as their efficacy has improved to surpass traditional light sources and the efficiency gains continue. White coloured LEDs are used in a variety of different situations, including the illumination of surface railway platforms.

On surface railway platforms, there is an incidence of suicides where individuals step/jump in front of a train from the platform. The individual often waits at the end of the platform, away from other individuals, railway staff (on manned stations) etc. before stepping off the platform.

Summary of the invention

Aspects of the invention are as set out in the independent claims and optional features are set out in the dependent claims. Aspects of the invention may be provided in conjunction with each other and features of one aspect may be applied to other aspects.

Drawings

Embodiments of the disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which:

Fig. 1 shows a schematic view of an example lighting apparatus for use on railway platforms;

Fig. 2 shows a perspective view of an example lighting system illuminating a railway platform;

-2Fig. 3 shows a schematic view of another example lighting apparatus for use on railway platforms; and

Fig. 4 shows an example flow chart for a method of illuminating a railway platform;

Fig. 5 shows an isometric view of an example luminaire forming part of an example lighting apparatus for use on railway platforms; and

Fig. 6 shows a plan view of the example luminaire of Fig. 5.

Specific description

Single colour white LEDs (rather than RGB LEDs that, when all colours are operated, provide a white light) are actually blue coloured LEDs with a phosphor coating to alter the spectral power of the light source to make it appear white to the human eye. Different amounts or types of phosphor are the main way to alter the colour appearance of the white from a warmer white with a yellowish tint or appearance to a cooler white with a blueish tint or appearance.

As LEDs have developed as a light source, considerable research has been carried out into human reaction to this particular white light and concerns have been raised by a number of professional and other bodies about the effect on human biology, chronobiology and neurology: in essence on human health.

The light emitted by LEDs can be controlled well by lenses or reflectors which can focus the light to the locations in which it is required. This often means that there is a concentration of light being focussed in particular areas producing an intensity of light. If humans look at the beam of light at relatively close distance and for relatively long periods, it can be detrimental to their ocular safety. LED luminaires are tested for this and granted a risk group in accordance with appropriate standards.

Adult humans have a reflex to close their eyes or avert their gaze when a bright light is shone into their eyes. This is particularly the case with white light. With coloured light, the effect of looking into the light is reduced, often significantly so there is no reflex to immediately look away. Blue light is particularly bad, however, because it both doesn’t invoke the “look-away” reflex and it is phototoxic, i.e. can cause ocular damage if exposure is for too long or at levels that are too high. Therefore to have permanent blue

-3lighting is potentially damaging to those spending long periods in the presence of the blue light such as those working on the platforms, those with existing ocular weakness or those exposed to “light trespass” from the blue light source such as occupants of nearby housing, businesses etc. There exists, therefore, a general prejudice in the field to avoid the use of blue light in LED luminaires.

The inventors of the present application have discovered, however, that where there is a high incidence of suicides, particularly on railway station platforms where the individual steps/jumps in front of a train, the use of motion-activated blue-coloured light helps reduce the number of suicide incidences.

Embodiments of the claims therefore relate to a railway platform lighting apparatus (for example, as shown in Figs. 1, 3, 5 and 6) and system (for example, as shown in Fig. 2) that uses a white light source such as an LED light source to illuminate the railway platform, and a separate blue light source such as an LED light source to illuminate a region of the railway platform when movement is detected near the end and/or edge of the railway platform. Embodiments of the claims also relate to a method (see, for example, Fig. 4) of illuminating a railway platform with a white light source, and a separate blue light source when movement is detected near the end of the railway platform. For example, when an individual gets within a certain distance of the end of the railway platform, the blue light is activated (switched on) by the PIR being triggered, and remains on until, for example, a set duration has passed in which the PIR has not been triggered again.

By only using a blue light source when movement is detected near the ends and/or edges of the railway platform, the potentially harmful and phototoxic side-effects of the blue light source can be minimised. Light trespass from the blue light source can also be minimised, particularly if the blue light sources are only provided at locations near the ends of the railway platforms. Because in cases of suicide the individual often waits at the end of the platform, away from other individuals, illuminating the blue light sources when movement is detected near the ends of the railway platform means that the blue light source is not unnecessarily activated, again helping to reduce unnecessary sideeffects to other individuals who may be on the platform. Furthermore, because the blue

-4light source only comes on when movement is detected near the end of the railway platform, it will give any such individual in the area the feeling of “being watched”, again helping to reduce the number of suicides.

An example railway platform lighting apparatus 100 is shown in Fig. 1. The railway lighting apparatus 100 comprises an enclosure housing a controller 106, a white light source 103 (which in this example is an LED light source) and a blue light source 105 (which in this example is also an LED light source). The railway lighting apparatus 100 also comprises a movement detector 101 coupled to the enclosure, which in this example is a passive infrared sensor (PIR) sensor, although of course other types of movement detector may be used.

The controller 106 is coupled to the movement detector 101, the blue light source 105 and the white light source 103. The lighting apparatus 100 is also coupled to an external power source (not shown). The enclosure of the railway lighting apparatus provides a sealed enclosure for the components (such as the controller 106, the blue light source 105 and white light source 103) inside the enclosure, such that the enclosure is weather resistant. The lighting apparatus 100 therefore provides a single unit that can be installed on a railway platform, for example as part of a lighting system (as shown in Fig. 2 and as described in more detail below).

The lighting apparatus 100 is configured to activate the blue light source 105 in response to movement being detected within a selected range of the movement detector. In the example shown, the lighting apparatus 100 is also configured to activate the first white light source 103 in response to at least one of (i) movement being detected on the railway platform within a second selected range of the movement detector and (ii) a train approaching the railway platform.

The controller 106 of the lighting apparatus 100 is operable to activate the light sources 103, 105 in response to movement being detected by controlling power delivered to the light sources 103, 105. For example, the controller 105 is coupled to the external power source (not shown) and is operable to control the power delivered to the light sources 103, 105 from the external power source in response to receiving a signal from the

-5movement detector 101 indicative of movement. The controller 105 may be programmable, so that the controller is operable to control the power supplied to each of the light sources 103, 105 in response to movement being detected above or below selected thresholds. For example, the white light source 103 may be activated by the controller 106 in response to the controller 106 receiving a signal indicative of movement above a first selected threshold, and the blue light source 105 may be activated by the controller 106 in response to the controller 106 receiving a signal indicative of movement above a second selected threshold.

In the examples discussed, the first selected range is smaller than the second selected range. For example, the first selected range may cover an area near or proximal to the end and/or edge of a railway platform, whereas the second selected range may cover a larger region of the railway platform. In the examples shown, the lighting apparatus 100 is configured to activate the white light source 103 in response to moving being detected anywhere on the train platform, and activate the blue light source 105 in response to movement being detected proximal to the end and/or edge of a railway platform, for example within five metres of an end of a railway platform.

The blue light source 105 is configured to emit light having a wavelength of between 450 and 495 nm, for example between 440 and 460 nm.

In use, the lighting apparatus 100 is installed on a railway platform, for example on a lighting column or as part of an overhead gantry. Power is supplied to the lighting apparatus 100 from an external power source. The controller 106 of the lighting apparatus 100 activates either the white light source 103 and/or the blue light source 103 in response to receiving a signal indicative of movement from the movement detector 101. In some examples, the controller 106 may periodically poll the movement detector 101 for a signal. In other examples, the controller 106 may simply wait to receive a signal from the movement detector 101.

In the example shown, the controller 106 activates the first white light source 103 in response to at least one of (i) movement being detected on the railway platform within a second selected range of the movement detector and (ii) a train approaching the railway

-6platform. The controller 106 also activates the blue light LED light source 105 in response to movement being detected within a first selected range of the movement detector. In the example shown, the first selected range is smaller than the second selected range and is arranged to cover a region proximate to the end of the railway platform. For example, the second selected range may cover a radius of at least ten metres, for example at least twenty metres from the movement detector 101. The first selected range may be a radius of less than ten metres, for example less than five metres from the movement detector 101.

In this way, the railway platform is lit with white light when passengers are waiting on the platform or passengers are about to alight onto the platform from an incoming train. When an individual walks to the end or edge of the railway platform, however, the lighting apparatus 100 illuminates the end or edge of the platform with blue light. This gives the individual the sensation that they are “being watched” and may help to reduce the instances of suicide. The controller 106 may turn off the blue light source 105 if movement has not been detected in the first selected range for a selected threshold, for example at least five minutes, for example at least ten minutes.

In some examples, the lighting apparatus 100 may comprise more than one of each light source 103, 105. For example, the lighting apparatus 100 may comprise a plurality of white light sources 105. The lighting apparatus 100 may not be provided in a single enclosure, but may instead be composed of a number of separate enclosures each coupled together, for example in series, to form a string of enclosures. For example, the first white light source 103 may comprise a plurality of white light sources spaced at intervals along the length of a railway platform. Each enclosure forming part of the string may comprise different components - for example, some enclosures may only comprise a white light source 103 and optionally a controller 106 and a movement detector 101, whereas others (for example enclosures forming the end of the string) may also comprise a blue light source 105, a controller 106 and a movement detector 101. For example, a single controller 106 may control a plurality of different enclosures 100 and a plurality of white light and/or blue light sources, 103, 105.

In some examples, the lighting apparatus may comprise a first controller 106 for the first

-7white source 103, and a second controller 106 for the second blue light source 105. In some examples the first controller 106 and second controller 106 are coupled to the same movement detector 101, but in other examples the first controller 106 and the second controller 106 may be coupled to respective movement detectors 101, so that each light source 103, 105 has a respective controller 106 and respective movement detector 101.

In some examples, the movement detector 101 doesn’t form part of the enclosure 100. For example, the movement detector 101 may be provided as a separate (external) unit that is coupled to the enclosure 100. In some examples (as will be described in more detail with respect to Fig. 2 below), a single movement detector 101 may be coupled to a number of different lighting apparatuses 100.

In some examples the controller 106 may be configured to operate exclusively one light source 103, 105 or the other. For example, when movement is detected in the first selected range in a region proximate to the end and/or edge of the railway platform, the controller 106 may deactivate (i.e. turn off) the white light source 103 and instead activate (i.e. turn on) the blue light source 105. This may serve to emphasise the effect of the blue light on the individual. However, in other examples the controller 106 is configured to activate both light sources 103, 105 at the same time, for example so that the blue light source 105 is only activated when the white light source 103 is also activated.

In some examples, as shown in Figs. 5 and 6, the lighting apparatus 100 may comprise separate movement detectors 101 for each light source 103, 105. In such examples, the movement detector 101 for the blue light source 105 may be customised in some way to adjust and/or tune the sensitivity of the movement detector 101 - for example the movement detector 101 may be at least partially surrounded by a shield. The shield may be configured to adjust and/or tune the sensitivity of the movement detector 101. For example, the shield may be arranged so that the movement detector 101 can only sense movement for a particular portion (for example a selected range of angles centred on the movement detector 101) of the railway platform. The shield may take any shape or form arranged to at least partially surround the movement detector 101, for example the shield

-8may be semi-spherical or horn-shaped.

In some examples the controller 106 may also be tuneable by a user or operator, such that the time either one of the light sources 103, 105 stays on for once activated may be tuned and adjusted. For example, the time that the blue light source 105 stays on for once activated may be tuneable.

A railway platform lighting system 275 that may use the railway platform lighting apparatus 100 of Fig. 1 is shown in Fig. 2. The railway platform lighting system 275 comprises a plurality of modular units 200, each comprising a white light source 203, spaced along the railway platform 250. The plurality of modular units 200 thereby form a string along the railway platform 250. Each modular unit 200 is similar to the lighting apparatus 100 of Fig. 1 except that each modular unit 200 does not comprise a blue light source 105 and does not comprise a movement detector 101, although it will be understood that in other example each modular unit 200 may comprise a respective movement detector 201 and a central movement detector 201 may not be needed.

The railway platform lighting system 275 also comprises a lighting apparatus comprising a white light source, a blue light source and a movement detector (such as the lighting apparatus 100 of Fig. 1) at each end of the string. Each lighting apparatus 100 thereby forms an end unit to the string of the lighting system 275. The plurality of white light sources 103, 203 are spaced at intervals along the length of the railway platform 250. A lighting apparatus 100 forming each end unit is placed proximal to each end of the railway platform 250, for example within at least ten metres, for example within at least five metres, for example within at least two metres, of the end of the railway platform 250. In this way, the lighting system 275 comprises at least one blue light source 105 proximal to each end of the railway platform 250.

The lighting system 275 also comprises a central controller 206 and a central movement detector 201. In the example shown, the central movement detector 201 is also a PIR sensor. The central movement detector 201 and central controller 206 are also coupled to the string of modular units 200 and the end units 100, and in the example shown they are coupled in series to the modular units 200 and the end units 100 of the string.

-9The lighting system 275 is configured to activate the blue light source 105 of each end unit 100 in response to movement being detected on the railway platform 250 in a first selected range of the movement detector. In the example shown, the lighting system 275 is configured to activate the blue light source 105 of each end unit 100 in response to movement being detected within a first selected range of the movement detector 101 by the movement detector 101 of each end unit 100. Because each end unit 100 is located proximal to the end of the railway platform 250, in the example shown, the first selected range corresponds to a region proximal or near the end of the railway platform 250, for example within at least ten metres of the end of the railway platform 250, for example within at least five metres of the end of the railway platform 250.

The central controller 206 is configured to control the white light sources 103, 203 of the system 275 based on a signal received from the central movement detector 201. In the example shown, the central controller 206 is configured to activate the white light source 203 of each modular unit 200 and the white light source 103 of each end unit 100. The lighting system 275 may optionally also have a sensor or other means for detecting an approaching train. The lighting system 275 is configured to activate the plurality of white light sources 103, 203 in response to at least one of (i) movement being detected on the railway platform in a second selected range of the central movement detector 201 and (ii) a train approaching the railway platform. In some examples the central movement detector 201 may be configured to sense both (i) movement being detected on the railway platform in a second selected range of the central movement detector 201 and (ii) a train approaching the railway platform.

The movement detector 101 of each end unit is therefore configured to detect movement on the railway platform over a range that is smaller than the range of movement detected by the central movement detector 201. Additionally or alternatively, the central movement detector 201 and the movement detector 101 of each end unit may be configured to detect movement over the same range, but the central controller 206 may be configured to activate the white light sources 103, 203 in response to movement being detected within a second selected range, and the controller 106 of each end unit may be configured to activate the blue light sources 105 in response to movement being

-10detected by each movement detector 101 of each end unit 100 within a first selected range, which may be smaller than the second selected range. As with the example of Fig. 1 described above, the selected ranges may be selected by a user and programmed into the central controller 206 and/or the controller 106 of each end unit 100.

In use, the lighting system 275 is installed on a railway platform 250, for example as part of an overhead gantry. Power is supplied to the lighting system 275 from an external power source. The central controller 206 of the lighting system 275 activates the white light source 103 of each end unit 100, and the white light source 203 of each modular unit 200, by controlling the power delivered to each light source 103, 203, in response to receiving a signal indicative of movement from the central movement detector 201. In some examples, the controller 206 may periodically poll the movement detector 201 for a signal. In other examples, the controller 206 may simply wait to receive a signal from the movement detector 201.

In the example shown, the controller 106 activates the white light sources 103, 203 in response to at least one of (i) movement being detected on the railway platform within a second selected range of the movement detector and (ii) a train approaching the railway platform.

The controller 106 of each end unit also activates the blue light source 105 of each end unit 100 in response to movement being detected within a first selected range. In the example shown, the first selected range is smaller than the second selected range and is arranged to cover a region proximate to the end of the railway platform. For example, the end units 100 may be located within at least ten metres, for example within at least five metres of the end of the railway platform 250. The second selected range may cover a radius of at least ten metres, for example at least twenty metres from the movement detector 101 of each end unit 100. The first selected range may be a radius of less than ten metres, for example less than five metres from the movement detector 101 of the end unit 100.

In this way, the railway platform is lit with white light when passengers are waiting on the platform or passengers are about to alight onto the platform from an incoming train.

-11 When an individual walks to the end of the railway platform, however, the end units 100 of the lighting system 275 illuminate the end of the platform with blue light. This gives the individual the sensation that they are “being watched” and may also help to reduce the instances of suicide. The controller 106 of each end unit 100 may turn off the blue light source 105 if movement has not been detected in the second selected range for a selected threshold, for example at least five minutes, for example at least ten minutes.

In the example shown in Fig. 2, each end unit comprises both a white light source 103 and a blue light source 105. However, in other examples, each end unit may only comprise a blue light source 105.

In the example shown in Fig. 2, each end unit 100 also comprises a respective movement detector 101 for its corresponding blue light source 105. However, in other examples, there may be a separate movement detector, for example a second and optionally third movement detectors (in addition to the central movement detector 106), placed proximate to each end of the railway platform 250 and coupled to the central controller 206, but not forming part of the enclosure of each end unit 100. In such examples, the central controller 206 may also be configured to activate the blue light sources 105 of each end unit 100 in response to movement being detected by a corresponding second or third movement detector proximate to an end of the railway platform 250.

In some examples, as shown in Fig. 3, a separate movement detector 301, 302 may be provided for each light source 303, 305. For example, the white light source 303 may be coupled (via the controller 306) to a first movement detector 301, and a blue light source 305 may be coupled (via the same controller 306) to a second movement detector 302. In this way, although the light sources 103, 105 share a common controller 306, they each have a respective movement detector 301, 302. Each respective movement detector 301, 302 may be specifically adapted to detect movement within a selected range or region.

For example, the lighting apparatus 300 may be configured to activate the white light source 303 in response to movement being detected by the first movement detector 301, and to activate the second blue light source 305 in response to movement being detected by the second movement detector 302.

It will of course be appreciated that the lighting apparatus of Fig. 3 may be used with the lighting system 275 of Fig. 2.

An example method for illuminating a railway platform is described with reference to Fig.

4. As shown in Fig. 4, the method comprises illuminating 401 a region of the railway platform with a blue light source in response to movement being detected on the railway platform in a first selected range. The method also comprises illuminating 403 the railway platform with a plurality of white light sources in response to at least one of (i) movement being detected on the railway platform in a second selected range of the movement detector and (ii) a train approaching the railway platform. The first selected range may be smaller than the second selected range.

Also described herein is a method of installing a railway platform lighting system. The lighting system may be the lighting system described above in relation to Fig. 2, and may be operated as described above with reference to Fig. 4. The method comprises placing a motion-activated blue light source proximal to the end of a railway platform, and placing a plurality of white light sources at intervals along the length of the railway platform.

In some examples, illuminating a region of the railway platform with a blue light source in response to movement being detected on the railway platform in a first selected range comprises illuminating a region of the railway platform proximal to the end and/or edge of the railway platform with a blue light source.

In some examples, illuminating a region of the railway platform with a blue light source in response to movement being detected on the railway platform in a first selected range comprises illuminating the railway platform with a blue light source in response to movement being detected in a region proximal to the end and/or edge of the railway platform. A region proximal to the end of the railway platform may comprise a region within at least ten metres, for example within at least five metres, of the end of the

- 13railway platform. A region proximal to the edge of the railway platform may comprise a region within at least five metres, for example within at least one metre, of the end of the railway platform.

In some examples, illuminating a region of the railway platform with a blue light source comprises illuminating the railway platform with light having a wavelength of between 440 and 495 nm, for example between 450 and 460 nm.

Although in the context of the present disclosure the white light sources 103, 203, 303 for illuminating the railway platform are described as being activated by a movement detector, it will be understood that in other examples the white light sources (such as the white light sources 103, 203, 303 of Figs. 1 to 3) may be activated by other means - for example the white light sources 103, 203, 303 may be activated by a selected timer program (for example controlled by the controller and/or according to a selected interval stored by the controller) or in response to luminescence level detected by a light sensor (i.e. the white light sources come on automatically at dusk and are switched off again at dawn). The white light sources 103, 203, 303 may also be activated by the controller 106, 206, 306 based on a signal received from a central management system, CMS.

In some examples the lighting apparatus 100, 300 of Figs. 1 and 3, or the lighting system 275 of Fig. 2, may comprise a sensor or other means for detecting an approaching train.

For example, controller 106, 306 or central controller 206 may be coupled to a control system that manages the railway tracks and points. The control system may provide a signal to the controller 106, 306 or central controller 206 to alert the controller 106, 306 or central controller 206 to the presence of an approaching train. Additionally or alternatively, the lighting apparatus 100, 300 or lighting system 275 may comprise a movement detector arranged to detect movement of an approaching train - for example the movement detector may be placed beyond the end of the railway platform along the railway track to detect an approaching train.

Figs. 5 and 6 show another example railway platform lighting apparatus 500. It will of course be appreciated that the lighting apparatus of Figs. 5 and 6 may be used with the lighting system 275 of Fig. 2. The lighting apparatus 500 of Figs. 5 and 6 is in many

-14respects similar to the lighting apparatus 300 shown in Fig. 3. The lighting apparatus

500 shown in Fig. 5 is a luminaire head, such as one of DW Windsor’s® Kirium® Pro range of luminaires. The luminaire head comprises a luminaire body 550 arranged to provide a watertight enclosure for housing electronic components of the lighting apparatus 500 within. The lighting apparatus 500 is configured to be mounted onto a pole or post near the base of the luminaire body 550 so that it is supported above a railway platform.

The lighting apparatus 500 shown in Figs. 5 and 6 comprises a white light source 503 and a blue light source 505 arranged adjacent to each other as part of the luminaire head. In the example shown, the white light source 503 and the blue light source 505 are LED light sources, and the lighting apparatus 500 comprises the necessary electronics (such as the LED drivers) for operating the light sources 503, 505 housed within the luminaire body 550. The lighting apparatus 500 also comprises a first movement detector 501 and a second movement detector 502 near the base of the luminaire body 500 adjacent to where the luminaire body 550 couples to a supporting pole or post. The first movement detector 501 and the second movement detector 502, in the example shown, are PIR detectors. Each movement detector 501, 502 is independently tuneable so that one movement detector may be sensitive to movement over a different range than the other. In this way, it is not immediately apparent to an observer from afar that the lighting apparatus 500 is any different to a normal luminaire head, other than the presence of the two movement detectors 501, 501.

The first movement detector 501 further comprises a shield 590 (as mentioned above). The shield 590 at least partially surrounds the movement detector 501. In the example shown, the movement detectors 501 and 502 are semi-spherical, and the shield 590 is partly dome-shaped to cover a portion of the semi-spherical surface of the first movement detector 501. The shield 590 does not completely cover the surface of the movement detector 501; instead it leaves a window open so that the movement detector

501 can detect movement within a selected range corresponding to the window in the shield 590. In this way, the sensitivity of the movement detector 501, and the angle over which the movement detector 501 can detect movement, can be controlled. In some examples the shape, size and/or orientation of the shield 590 can be adjusted by a user (for example, the shield may be rotatable), but in other examples, the position and dimensions of the shield 590 may be fixed. It will of course be understood that in some examples the second movement detector 502 may also comprise a shield 502.

The lighting apparatus 500 is configured to activate the blue light source 505 in response to movement being detected within a first selected range of the first movement detector 501. The lighting apparatus 500 is also configured to activate the white light source 503 in response to movement being detected within a second selected range of the second movement detector 502, wherein the first selected range is smaller than the second selected range. For example, in situations where the lighting apparatus 500 is mounted above a railway platform, the lighting apparatus 500 is configured to activate the white light source 503 in response to at least one of (i) movement being detected on a railway platform within a second selected range of the second movement detector 502 and (ii) a train approaching the railway. Because the first movement detector 501 comprises a shield 590 arranged to adjust the angle over which the first movement detector 501 detects movement, the orientation of the shield 590 can be adjusted so that the lighting apparatus 500 is configured to activate the blue light source 505 in response to movement being detected proximal to an end and/or edge of the railway platform. Advantageously, the shield 590 may help to prevent inadvertent activation of the blue light source 505 by a passing train or by people on the railway platform but not near the end and/or edge of the railway platform.

Although not shown in Figs. 5 or 6, it will of course be appreciated that in some examples the lighting apparatus 500 of Figs. 5 and 6 may comprise a controller, such as the controller 106, 206 or 306 described above in relation to Figs. 1 to 3, and/or that the lighting apparatus 500 may comprise a respective controller for controlling each respective light source 503, 505. For example, with reference to Figs. 5 and 6, the first movement detector 501 may be coupled to a first controller operable to control the blue light source 505 based on signals received from the first movement detector 501. The second movement detector 501 may be coupled to a second controller operable to control the white light source 503 based on signals received from the second movement detector 502, independently of the first movement detector 501 and/or first controller.

- 16ln the context of the above examples, a white light source is used. The white light source may be any light source that is configured to mimic daylight. This may include a white LED light source.

In the context of the above examples, it will be understood that the movement detector may be calibrated for its intended use. For example, the movement detector of any of the above examples may be calibrated for human movement, for example so that the light sources are not inadvertently activated by birds (for example pigeons) or wildlife (foxes, cats etc.) on the railway platform.

It will be appreciated from the discussion above that the embodiments shown in the Figures are merely exemplary, and include features which may be generalised, removed or replaced as described herein and as set out in the claims. In the context of the present disclosure other examples and variations of the apparatus and methods 15 described herein will be apparent to a person of skill in the art.

Claims

CLAIMS:

1. A railway platform lighting apparatus, comprising:

a white light source;

a blue light source; and at least one movement detector for detecting movement on the railway platform; wherein the lighting apparatus is configured to activate the blue light source in response to movement being detected within a first selected range of the movement detector.

2. The lighting apparatus of claim 1 wherein the lighting apparatus is configured to activate the white light source in response to at least one of (i) movement being detected on the railway platform within a second selected range of the movement detector and (ii) a train approaching the railway platform, wherein the first selected range is smaller than the second selected range.

3. The lighting apparatus of claim 1 or 2 wherein the lighting apparatus is configured to activate the blue light source in response to movement being detected proximal to an end and/or edge of the railway platform.

4. The lighting apparatus of claim 3 wherein the lighting apparatus is configured to activate the blue light source in response to movement being detected within five metres of an end of the railway platform.

5. The lighting apparatus of any of the previous claims wherein the white light source comprises a plurality of white light sources spaced at intervals along the length of the railway platform.

6. The lighting apparatus of any of the previous claims wherein the at least one movement detector comprises a PIR sensor.

7. The lighting apparatus of any of the previous claims comprising a first controller for the white light source, and a second controller for the blue light source, wherein the first controller and second controller are coupled to the same movement detector.

8. The lighting apparatus of any of claims 1 to 6 wherein the at least one movement detector comprises a first movement detector for detecting movement on the railway platform, and a second movement detector for detecting movement proximal to an end and/or edge of the railway platform, and wherein the lighting apparatus is configured to activate the white light source in response to movement being detected by the first movement detector, and to activate the blue light source in response to movement being detected by the second movement detector.

9. The lighting apparatus of any of the previous claims wherein the blue light source is configured to emit light having a wavelength of between 440 and 495 nm.

10. The lighting apparatus of any of the previous claims wherein the blue light source is configured to emit light having a wavelength of between 450 and 460 nm.

11. The lighting apparatus of any of the previous claims wherein activating the white light source and activating the blue light source comprises providing power to the respective light source so that the respective light source provide a source of illumination.

12. A railway platform lighting system, comprising:

a plurality of white light sources spaced along the railway platform;

at least one blue light source proximal to an end and/or edge of the railway platform;

at least one movement detector for detecting movement on the railway platform; wherein the lighting system is configured to activate the blue light source in response to movement being detected on the railway platform in a first selected range of the movement detector.

13. The railway platform lighting system of claim 12 wherein the lighting system is configured to activate the plurality of white light sources in response to at least one of (i) movement being detected on the railway platform in a second selected range of the movement detector and (ii) a train approaching the railway platform.

14. The railway platform lighting system of claim 12 or 13 further comprising a second movement detector for detecting movement on the railway platform proximal to an end of the railway platform, and wherein the lighting system is configured to activate the blue light source in response to movement being detected proximal to the end and/or edge of the railway platform by the second movement detector.

15. A railway platform lighting system, comprising:

a plurality of white light sources spaced at intervals along the length of the railway platform; and at least one railway platform lighting apparatus according to any of claims 1 to 11; wherein the lighting system is configured to activate the blue light source of the at least one railway platform lighting apparatus in response to movement being detected in a first selected range of the movement detector on the railway platform by the movement detector of the at least one railway platform lighting apparatus; and wherein the lighting system is configured to activate the plurality of white light sources including the white light source of the at least one railway platform lighting apparatus in response to at least one of (i) movement being detected on the railway platform in a second selected range of the movement detector and (ii) a train approaching the railway platform.

16. The railway platform lighting system of any of claims 12 to 15 further comprising a second movement detector for detecting movement on the railway platform, and wherein the lighting system is configured to activate the plurality of white light sources in response to movement being detected on the railway platform in the second selected range by the second movement detector.

17. The railway platform lighting system of claim 16 wherein the second movement detector comprises a PIR sensor.

18. The railway platform lighting system of any of claims 12 to 17 wherein the first selected range is smaller than the second selected range.

19. The railway platform lighting system of any of claims 13 to 18 wherein the lighting system is configured to activate the blue light source in response to movement being detected by the movement detector of the at least one railway platform lighting apparatus proximal to an end of the railway platform.

20. The railway platform lighting system of claim 19 wherein the lighting system is configured to activate the blue light source in response to movement being detected by the movement detector of the at least one railway platform lighting apparatus within five metres of an end of the railway platform.

21. The railway platform lighting system of any of claims 12 to 20 wherein the blue light source is configured to emit light having a wavelength of between 440 and 495 nm.

22. The railway platform lighting system of any of claims 12 to 21 wherein the blue light source is configured to emit light having a wavelength of between 450 and 460 nm.

23. The lighting system of any of claims 12 to 22 wherein activating a light source comprises providing power to the light source so that the light source provides a source of illumination.

24. A method of illuminating a railway platform, comprising:

illuminating a region of the railway platform with a blue light source in response to movement being detected on the railway platform in a first selected range; and illuminating the railway platform with a plurality of white light sources in response to at least one of (i) movement being detected on the railway platform in a second selected range and (ii) a train approaching the railway platform.

25. The method of claim 24 wherein the first selected range is smaller than the second selected range.

26. The method of claim 24 or 25 wherein illuminating a region of the railway platform with a blue light source in response to movement being detected on the railway platform in a first selected range comprises illuminating a region of the railway platform proximal to the end of the railway platform with a blue light source.

27. The method of any of claims 24 to 26 wherein illuminating a region of the railway platform with a blue light source in response to movement being detected on the railway platform in a first selected range comprises illuminating the railway platform with a blue light source in response to movement being detected in a region proximal to the end and/or edge of the railway platform.

28. The method of any of claims 24 to 27 wherein a region proximal to the end of the railway platform comprises a region within at least five metres of the end of the railway platform.

29. The method of any of claims 24 to 28 wherein illuminating a region of the railway platform with a blue light source comprises illuminating the railway platform with light having a wavelength of between 440 and 495 nm.

30. The method of any of claims 24 to 29 wherein illuminating a region of the railway platform with a blue light source comprises illuminating the railway platform with light having a wavelength of between 450 and 460 nm.

31.

31. A method of installing a railway platform lighting system, comprising:

placing a motion-activated blue light source proximal to the end of a railway platform; and placing a plurality of white light sources at intervals along the length of the railway platform.

32. A computer readable non-transitory storage medium comprising a program for a computer configured to cause a controller to perform the method of any of claims 24 to