GB2298043A - Lighting apparatus switched according to ambient light level - Google Patents

Lighting apparatus switched according to ambient light level Download PDF

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Publication number
GB2298043A
GB2298043A GB9503215A GB9503215A GB2298043A GB 2298043 A GB2298043 A GB 2298043A GB 9503215 A GB9503215 A GB 9503215A GB 9503215 A GB9503215 A GB 9503215A GB 2298043 A GB2298043 A GB 2298043A
Authority
GB
United Kingdom
Prior art keywords
ambient light
light level
lamp
lighting apparatus
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9503215A
Other versions
GB9503215D0 (en
Inventor
Michael Allcock
Resphpal Singh Sangha
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FW Thorpe PLC
Original Assignee
FW Thorpe PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FW Thorpe PLC filed Critical FW Thorpe PLC
Priority to GB9503215A priority Critical patent/GB2298043A/en
Publication of GB9503215D0 publication Critical patent/GB9503215D0/en
Publication of GB2298043A publication Critical patent/GB2298043A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

A fluorescent or discharge lamp with electronic ballast is arranged to be switched on automatically when the ambient light level falls to a predetermined level. This is achieved by using a photodiode D18 supplied by the low voltage circuitry of the lamp to complete a circuit and switch on the lamp. The photodiode D18 is connected to a comparator IC1 and the predetermined switching level is set by a pair of resistors R10 and R20. A time delay is provided by capacitor C9 and resistor R9 to avoid unnecessary switching on and off around dawn and dusk.

Description

LIGHTING APPARATUS This invention relates to lighting apparatus especially, but not exclusively, for public places, where a given level of light is required. A simple solution for this purpose is to provide electric light of a sufficient output to give the required light level at the darkest time and runs this non-stop. Thus, if a 24 hour utilization is involved, then the lamps will be selected to give sufficient light even on the darkest night.
However, in this simplest form the light would be quite unnecessary in normal levels of daylight and therefore be waste electricity and necessitate more frequent replacement of lamps, as compared to a situation where the light is only switched on when necessary because of a fall in ambient light level.
The object of the invention is to solve this problem in a cost efficient manner.
According to the invention a lighting circuit comprising a fluorescent or discharge lamp of the kind provided with an electronic ballast having internal low voltage circuitry, is switched on or off according to the ambient light level falling on a photo-diode supplied by said low-voltage circuitry, and which is arranged so that its output, when the ambient light level is below that required, completes the circuit, so as to switch on the lamp.
Conveniently the photo-diode is connected to a comparator and the set point for switch on and off is determined by a pair of resistors in lines feeding the comparator.
One example of circuitry embodying the invention and providing for a pair of fluorescent lamps, so as to provide a lamp and a backup in the event of lamp failure, is shown in the accompanying drawing. The circuitry which is more specific to the invention is located within the area enclosed by the broken line.
Referring to the drawing, the comparator is the component IC 1 and the diode sensing ambient light is the component D 18. The resistors which determine the value of light required to trigger component TR 4 is the resistors R 10 and R 20.
Time delay is achieved by compacitor C 9 and resistor R 9: this is so that at times of changing light level for example towards dusk or dawn, the lamps are not switched on and off alternatively due to mere minor changes in light value.
Resistor R 19 provides hysterisis.
As will be appreciated by the man skilled in the art, circuit TR 4 is in fact required for other safety functions of the ballast apart from the use of the present invention.

Claims (2)

1. A lighting circuit comprising a fluorescent or discharge lamp having an electronic ballast with internal low voltage circuitry, arranged to be switched on or off according to the ambient light level falling on a photodiode supplied by said low voltage circuitry, and which is arranged so that the diode output completes the circuit when the ambient light level is below that required so as to switch on the lamp.
2. A lighting circuit as claimed in Claim 1 wherein the photo-diode is connected to a comparator and the set point for switch on and off is determined by a pair of resistors in lines feeding the comparator.
GB9503215A 1995-02-18 1995-02-18 Lighting apparatus switched according to ambient light level Withdrawn GB2298043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9503215A GB2298043A (en) 1995-02-18 1995-02-18 Lighting apparatus switched according to ambient light level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9503215A GB2298043A (en) 1995-02-18 1995-02-18 Lighting apparatus switched according to ambient light level

Publications (2)

Publication Number Publication Date
GB9503215D0 GB9503215D0 (en) 1995-04-05
GB2298043A true GB2298043A (en) 1996-08-21

Family

ID=10769841

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9503215A Withdrawn GB2298043A (en) 1995-02-18 1995-02-18 Lighting apparatus switched according to ambient light level

Country Status (1)

Country Link
GB (1) GB2298043A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326473A (en) * 1997-06-21 1998-12-23 Sli Lighting Limited Fluorescent lighting system with ambient light detector
ITBA20100013A1 (en) * 2010-03-17 2010-06-16 Rocco Carone ALARM DEVICE OR COMMAND WHOSE SENSOR ELEMENTS ARE CONSTITUTED BY ONE OR MORE PAIRS OF UNIPOLAR ELECTRIC CABLES COMBINED WITH ONE OR MORE DETECTION ELEMENTS.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333912A (en) * 1969-10-20 1973-10-17 Mullard Ltd Lighting control arrangements
GB1582356A (en) * 1978-02-06 1981-01-07 Smith A W A Security systems for buildings
US4937499A (en) * 1986-09-22 1990-06-26 Hunte Herbert H Photosensitive illuminating display
EP0441253A1 (en) * 1990-02-04 1991-08-14 Gaash Lighting Industries Electronic ballast for gas discharge lamp
EP0445757A2 (en) * 1990-03-07 1991-09-11 TDK Corporation Electric discharge lamp unit
GB2261945A (en) * 1991-11-30 1993-06-02 Royce Thompson Electric Limite A photosensitive electrical controller for street lighting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333912A (en) * 1969-10-20 1973-10-17 Mullard Ltd Lighting control arrangements
GB1582356A (en) * 1978-02-06 1981-01-07 Smith A W A Security systems for buildings
US4937499A (en) * 1986-09-22 1990-06-26 Hunte Herbert H Photosensitive illuminating display
EP0441253A1 (en) * 1990-02-04 1991-08-14 Gaash Lighting Industries Electronic ballast for gas discharge lamp
EP0445757A2 (en) * 1990-03-07 1991-09-11 TDK Corporation Electric discharge lamp unit
GB2261945A (en) * 1991-11-30 1993-06-02 Royce Thompson Electric Limite A photosensitive electrical controller for street lighting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2326473A (en) * 1997-06-21 1998-12-23 Sli Lighting Limited Fluorescent lighting system with ambient light detector
GB2326473B (en) * 1997-06-21 2001-05-02 Sli Lighting Ltd Lighting system
ITBA20100013A1 (en) * 2010-03-17 2010-06-16 Rocco Carone ALARM DEVICE OR COMMAND WHOSE SENSOR ELEMENTS ARE CONSTITUTED BY ONE OR MORE PAIRS OF UNIPOLAR ELECTRIC CABLES COMBINED WITH ONE OR MORE DETECTION ELEMENTS.

Also Published As

Publication number Publication date
GB9503215D0 (en) 1995-04-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)