DE102015204716A1 - Socket for a lamp tube - Google Patents

Abstract

A socket (100) for a lamp tube (201) having an axis of symmetry (S) has a mounting area (104) for attachment to one end of the lamp tube (201), a terminal area (102) having at least one electrical contact element (101) for electrical contacting on a lamp holder (204) and a resilient region (103), which is arranged between the fastening region (104) and the connection region (102). The resilient region (103) is equipped such that an axial thermal change in length of the lamp tube in the direction of the lamp holder is compensated, as far as the base (101) attached to the lamp tube (201) is in electrical contact with the lamp holder (204). A tube lamp (601) is described in which effective compensation for the thermal expansion of the lamp tube (201) by the pedestal (100) is provided.

Description

The present invention relates to a socket for a lamp tube. The invention further relates to a tube lamp with a lamp tube, wherein at least one end of the lamp tube, a base is arranged.

There are known retrofit lamps with light-emitting diodes, which can be installed as a replacement for double ended fluorescent lamps in existing lights. The geometry of double capped fluorescent lamps is defined in various international standards. In this case, the distance between the two lateral versions, in which the fluorescent lamp is used for electrical contact in the luminaire, determined by the existing standardization. In LED retrofit lamps is usually used as a lamp tube, a plastic piston instead of a glass bulb, the plastic piston normally has a higher thermal expansion than the glass bulb.

The higher thermal expansion of a plastic lamp tube causes the double-ended LED retrofit lamp to slip out of the mountings at low ambient temperatures or to press against the mountings at high ambient temperatures, thus causing damage to the mount or the lamp tube.

For this reason, it is known that in double-ended LED retrofit lamps using a plastic lamp tube, an aluminum alloy heat sink is used which extends the entire length of the lamp tube. At the ends of the lamp tube, the pedestals are connected directly to the heat sink and thus the length of the retrofit lamp is determined by the coefficient of thermal expansion of the heat sink. The problem of elongation can be reduced by this design measure, but not completely resolved, since the thermal expansion coefficients of the heat sink and glass continue to have different values. In addition, the use of a heat sink adds to the cost and weight of the retrofit lamp.

The present invention is based on the problem of providing a constructional element for a lamp tube, which reduces the disadvantages of the prior art. It is a further object of the invention to provide a tube lamp (e.g., LED retrofit lamp) which can be operated with sufficient safety in existing luminaires.

According to the invention this problem solves a socket according to claim 1. Further developments and advantageous embodiments of the base and the tube lamp can be found in the dependent claims and the description below.

EMBODIMENTS OF THE BASE

An embodiment of the socket for a lamp tube having an axis of symmetry has a mounting area for attachment to one end of the lamp tube. The lamp tube may be formed by any partially translucent element. The lamp tube may be a diffused, i. arranged for light scattering, or transparent, i. be clear, pipe. The lamp tube may have other materials or particles in addition to a base material, which improve the scattering effect of the lamp tube. The lamp tube preferably has plastic and / or glass. For example, it may be made of plastic and / or glass.

The base is fastened with its attachment area to one end of the lamp tube. In this case, the mounting portion of the base may be at least partially inserted into one end of the lamp tube or one end of the lamp tube may be at least partially inserted into the mounting portion of the base. In one embodiment, the fastening region of the base and the one end of the lamp tube are connected to one another directly at the respective front sides. The conclusive connection of the two connection partners can be formed cohesively, positively or non-positively.

In a cohesive connection, at least two connection partners are connected to one another by means of atomic and / or molecular forces. This can be done for example by means of a connection means. Bonded joints can only be broken by destruction, e.g. by destruction of the bonding agent, separate. In the described embodiments, a cohesive connection can be embodied, for example, as an adhesive connection, a solder connection or as a welded connection.

Positive connections arise through the intermeshing of at least two connection partners, wherein the movement of the first connection partner can be limited by a surface of the second connection partner. In the case of a positive connection, one connection partner is in the way of the other in at least one direction. In various embodiments, a positive connection may be formed by a clamping or a latching connection.

In a non-positive connection can - due to a physical contact of the two Body under pressure - a static friction restrict movement of the first body parallel to the second body. An example of a frictional connection may be formed by a press fit between a first body and a second body.

The base further comprises a connection region with at least one electrical contact element for making electrical contact with a lamp socket. By adhering to the geometric and safety specifications set forth in international standards for socket sockets, it is ensured that the base for lamps can be used in existing luminaires. The lighting means may thus be a direct replacement product or a retrofit product, e.g. LED lamp, act.

The base further includes a resilient portion disposed between the mounting portion and the terminal portion, the resilient portion being provided so as to compensate for axial thermal length change of the lamp tube toward the lamp socket insofar as the socket fixed to the lamp tube is in electrical contact with the lamp socket Lamp socket stands.

There are known retrofit lamps with light-emitting diodes, which can be installed as a replacement for double ended fluorescent lamps in existing lights. In the LED retrofit lamps, a plastic bulb (e.g., polycarbonate) is commonly used as the lamp tube, instead of a glass bulb (soda-lime glass) used as a standard material in fluorescent lamps. However, compared to glass, plastic pistons typically have a significantly higher coefficient of thermal expansion. With a lamp length of 1.5 m and a temperature range of -20 ° C to + 60 ° C, this results in a difference in the length dimensions of about 7mm between a lamp tube made of polycarbonate (coefficient of linear expansion about 70 × 10-6 1 / K) and a lamp tube made of soda-lime glass (coefficient of linear expansion approx. 9.8 × 10-6 1 / K).

By using the base in double-ended LED retrofit lamps with a plastic piston, the above-described different length expansion of the piston is compensated by the resilient portion of the base. At high temperatures, the resilient portion of the base is compressed by the thermal expansion of the plastic tube, while at low temperatures the resilient portion expands, thus compensating for the thermal shortening of the piston.

This refinement ensures that the LED retrofit lamps with the at least one contact element do not slip out of the socket at low temperatures. Thus, safety-critical situations are prevented, such as e.g. a drop of the lamp or arcing between the contact element of the base and the electrical contact of the socket. At high temperatures, however, prevents the resilient area that the connection area of the base by the expanding lamp tube presses too strong against the lamp socket. Thus, a bending of the lamp tube or damage to the lamp socket is avoided.

Compared to traditional double-ended LED retrofit lamps, pedestal lamps can be approved for a wider temperature range without compromising safety-related aspects. Depending on the desired temperature range and material of the lamp tube, the resilient area may be structurally adapted. It is optionally possible to use a socket only at one end of the lamp tube or at both ends of the lamp tube.

It is a further embodiment of the base that the resilient region comprises an elastically deformable material. Due to the elastic material properties of the resilient region can be compressed in a pressure situation, the resilient region is shortened. In a subsequent discharge, the resilient region can expand back into its original length due to the residual stress of the elastic material. Pressure situation and relief are caused by the change in length of the lamp tube at different temperatures.

It is another embodiment of the socket that the resilient portion includes a bellows. Also in this constructive design of the resilient region can be compressed in a pressure situation, the bellows is compressed. In a subsequent relaxation of the bellows expands due to its resilient properties back to its original length. Pressure situation and relief are in turn caused by the change in length of the lamp tube at different temperatures.

The bellows is set in its structural design such that the required minimum nominal length of the unit "base with lamp tube" is achieved in the field of application at low temperatures and at the same time has at least one spring travel, so that the thermal expansion of the lamp tube is compensated in the application at high temperatures. The same consideration applies to the aforementioned embodiment with an elastic material as a resilient region.

It is also an embodiment of the base that at least one pressure element is arranged between the connection region and the attachment region.

The pressure element ensures that the springy area over the entire period of use, regardless of material fatigue and other negative influences, such. Pollution, at least in its originally constructive fixed initial length in the force-free state returns. By using a pressure element, less expensive materials with low material properties can be used for the resilient area.

It is a development that the pressure element itself acts as a resilient area. In this development, the connection area can be connected directly to the mounting area of the base. The base can be attached to one end of the lamp tube axially displaceable form the lamp tube. This can be realized by locking lugs on the base and at the end of the lamp tube. The pressure element, which is arranged in the inner region of the base between connection and mounting area, pushes the base in its maximum possible starting position.

It is a further embodiment of the base, that the pressure element is designed as an electrically conductive element and is electrically conductively connected to the at least one electrical contact element.

As soon as a voltage source is connected to the at least one contact element of the base, the pressure element can forward the supply voltage to the light-generating unit, which is located inside the lamp tube. The light-generating unit may be e.g. to act an electrical driver with LEDs connected or the filament of a fluorescent lamp. The light generating unit is not limited to the examples described and other variations will be apparent to those skilled in the art.

It is also an embodiment of the base that the pressure element comprises a mechanical spring. In the manufacture of mechanical springs, mature technology can be used, the manufacture of electrically conductive material, e.g. made of a wire of spring steel, can be done. Consistent resilient properties and a high number of stress cycles can be ensured by a mechanical spring over a long period of use.

It is also an embodiment of the base, that connection area, mounting area and resilient area are formed from at least two different materials. This ensures that the material selection of the three areas can be adjusted according to the technical requirements of the individual areas.

Connection and attachment areas are preferably made of a mechanically stable material, such as e.g. Aluminum sheet or PBT plastic, manufactured. When determining the material for the connection area, the connection technology with the lamp tube and the material of the lamp tube is also taken into account.

In the determination of the material for the resilient area are material properties such as elastic deformability and durable elastic properties in the foreground. The choice of available materials is varied and can be made by the skilled person according to the technical requirements. Possible materials for a bellows are, for example, PVC or various types of rubber.

It is a further embodiment of the base that the resilient region at least in terms of magnitude compensates for the thermal change in length of the lamp tube in a temperature range of -20 ° C to + 80 ° C.

Since bulbs for general lighting are used mainly in the above-mentioned temperature range, it is desirable from the manufacturer's point of view and the user that the resilient portion can compensate for the thermal length change of the lamp tube for this temperature range. This ensures that a two-sided socketed tube lamp must be equipped only with a base according to the invention and the lamp can always be used regardless of the ambient temperature always easily in the two side sockets of the lamp.

The object is also achieved by a tube lamp with a lamp tube, wherein at least one end of the lamp tube, a socket, as in the embodiments described above, is arranged.

The base is fastened with its attachment area to one end of the lamp tube. In this case, the mounting portion of the base may be at least partially inserted into one end of the lamp tube or one end of the lamp tube may be at least partially inserted into the mounting portion of the base. In one embodiment, the mounting area of the base and the one End of the lamp tube connected directly to the respective end faces. The conclusive connection of the two connection partners can be formed cohesively, positively or non-positively.

It is still an embodiment that the tube lamp is a LED retrofit lamp. It is therefore provided as a replacement lamp for conventional tube lamps and has as light source (s) at least one semiconductor light source. The LED retrofit lamp can be used as a replacement for a double ended fluorescent lamp.

It is still an embodiment that the tube lamp is a lamp tube made of at least partially transparent material.

The lamp tube may be a diffused, i. arranged for light scattering, or a transparent, i. be clear, pipe. The lamp tube may have other materials or particles in addition to a base material, which improve the scattering effect of the lamp tube. The lamp tube preferably has plastic and / or glass. For example, it may be made of plastic and / or glass.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of the solution according to the invention are explained in more detail below with reference to the drawings. In the figures, the first digit (s) of a reference numeral indicate the figure in which the reference numeral is used first. The same reference numerals are used for similar or equivalent elements or properties in all figures.

Show it

1 a schematic representation of a socket according to a first embodiment;

2a a schematic representation of a base according to the first embodiment with a lamp tube, inserted into a lamp in a sectional view;

2 B a schematic representation of a base according to the first embodiment with lamp tube, used in a lamp under thermal stress in a sectional view;

3 a schematic representation of a base according to a second embodiment with lamp tube in a sectional view;

4 a schematic representation of a base according to a third embodiment with pressure element and lamp tube, inserted into a lamp in a sectional view;

5a a schematic representation of a base according to a fourth embodiment with pressure element and lamp tube, inserted into a lamp in a sectional view;

5b a schematic representation of a base according to a fourth embodiment with pressure element and lamp tube used in a lamp under thermal stress in a sectional view;

6 a schematic representation of a two-sided socketed LED retrofit lamp with a socket according to the second embodiment.

EMBODIMENTS OF THE LIGHTING DEVICE

1 shows a socket as a sectional view 100 according to a first embodiment. The base 100 is from the three functional areas mounting area 104 , Connection area 102 and resilient area 103 built up. The attachment area 104 used for attachment to one end of the lamp tube. The connection area 102 with its contact element 101 used for electrical contact with a lamp socket. The springy area 102 serves to compensate for an axial thermal expansion of a longitudinal 1 not shown lamp tube. The length of the resilient region can thus shorten or lengthen depending on the mechanical stress (tensile or compressive stress).

terminal area 102 and attachment area 104 of the base are made of mechanically stable material, such as aluminum sheet or PBT plastic. The springy area 103 is made of an elastically deformable material 105 , such as PVC or rubber.

2a shows a sectional view of a socket with lamp tube, inserted into a lamp according to the first embodiment.

In 2a is the pedestal 100 with its attachment area 104 and the resilient area 103 into an open end of the lamp tube 201 , symmetrical to the symmetry axis S introduced. The outer diameter of the base 100 is smaller than the inner diameter of the lamp tube. The connection area 102 of the pedestal 100 with its contact element 101 , is outside the lamp tube 201 arranged. The attachment area 104 is through a bond 202 cohesively with the lamp tube 201 connected.

Other alternative geometric arrangements and mounting technologies are also possible. For example, one end of the lamp tube 201 at least partially in the attachment area 104 of the socket (see 3 ) or the attachment area 104 of the base and the one end of the lamp tube 201 be connected to each other directly at the respective end faces. The conclusive connection of fastening area 104 and lamp tube 201 can be performed by cohesive, positive or non-positive Verbindungstechnoliegen. The definition of the connection technology is determined by the materials used for the fastening area 104 and the lamp tube 201 certainly.

The lamp tube 201 is diffuse or transparent and is made of plastic or glass. The basic material of the lamp tube 201 may have other materials or particles that the scattering effect of the lamp tube 201 improve.

The lamp tube 201 with the single-sided base 100 is in a light 203 arranged. The base 100 is over the contact element 101 of the connection area 102 electrically conductive with the lamp socket 204 in the light 203 connected.

In 2a No axial tensile or compressive forces act on the resilient area 103 of the pedestal.

2 B shows a sectional view of a socket with lamp tube, inserted into a lamp according to the first embodiment under thermal stress.

By thermal heating of the lamp tube 201 , eg caused by the electric operation of the lamp tube 201 or by increasing the ambient temperature, there is an axial thermal change in length L of the lamp tube 201 in the direction of the lamp socket 204 ; the lamp tube 201 expands. About the cohesive connection between the lamp tube 201 and attachment area 104 the thermal change in length L is transferred to the base. Because the connection area 102 the socket with the lamp socket 204 is connected, this connection thus acts as a geometric boundary, acts on the resilient region 103 a compressive stress. Due to the elastic material properties of the resilient area 102 can the thermal change in length L of the lamp tube 201 and thus also the compressive stress can be compensated. The elastically deformable material 105 will be between attachment area 104 and connection area 102 pushed together, he shortens himself. Consequently, the thermal length change L of the lamp tube becomes 201 not on the connection area 102 transferred to the base. The connection area 102 of the socket does not press too hard against the lamp socket 204 , There is no damage to the lamp socket 204 or to a deflection of the lamp tube 201 ,

In a subsequent cooling of the lamp tube 201 to the starting temperature, the lamp tube shortens 201 back to their original starting length. On the springy area 103 acts a tensile stress. The springy area 103 can expand back to its original length due to the residual stress of the elastic material and the tensile stress. base 100 and lamp tube 201 take the in 2a illustrated starting situation again.

3 shows a sectional view of a socket with lamp tube according to a second embodiment.

In 3 is an end of the lamp tube 201 at least partially in the attachment area 104 of the socket. The outer diameter of the lamp tube is smaller than the inner diameter of the mounting area. The attachment area 104 is through a bond 202 cohesively with the lamp tube 201 connected.

The springy area 103 the base is as a bellows 301 educated. Also in this constructive design of the resilient area 103 compressed in a pressure situation (compressive stress), the bellows 301 is compressed. In a subsequent relaxation (tension) of the bellows expands 301 due to its resilient properties back to its original length. Pressure situation and discharge are in turn due to the change in length of the lamp tube 201 effected at different temperatures. The mode of action is analogous to that in 2a and 2 B described situation as soon as the socket 100 with the lamp tube 201 into the lamp socket 204 a lamp 203 is used.

The bellows 301 is set in its constructive design so that the minimum required nominal length of the unit "base with lamp tube" is achieved in the application and the bellows at the same time has at least one spring that in the range of application at high temperatures, the thermal expansion of the lamp tube 201 is compensated. The same consideration applies to the embodiment shown above with an elastic material 105 as a resilient area 103 , according to the first embodiment.

4 shows a sectional view of a base with pressure element and lamp tube, used in a lamp according to a third embodiment.

In 4 is the pedestal with its mounting area 104 and the resilient area 103 into an open end of the lamp tube 201 , symmetrical to the symmetry axis S introduced. The outer diameter of the base is smaller than the inner diameter of the lamp tube 201 , The connection area 102 the socket with its contact element 101 , is outside the lamp tube 201 arranged. The attachment area 104 is through a bond 202 cohesively with the lamp tube 201 connected. The springy area 103 the base is as a bellows 301 educated.

Inside the lamp tube 201 is a driver electronics 402 arranged. The driver electronics 402 converts the electrical supply signals (eg a mains voltage) into suitable electrical signals, for those in the lamp tube 201 located light source (in 4 not shown) to. For this the driver electronics must 402 with the contact element 101 of the connection area 102 the base be electrically connected. The light source may be, for example, a semiconductor light source (LED).

Between the first electrical contact point 403 of the contact element 101 and the second electrical contact point 404 the driver electronics 402 is electrically conductive a pressure element 401 arranged.

By the pressure element 401 will ensure that the springy area 103 regardless of material fatigue of the resilient area, at least returns to its original constructively fixed initial length in the force-free state over the entire period of application. In a cooling phase of the lamp tube 201 in which is the lamp tube 201 shortened and thus forms a tensile stress, is by the pressure element 401 built up a reverse voltage, so that the connection area 102 the socket with sufficient force in the lamp socket 204 is held. The contact element 101 of the connection area 102 is thus due to the shortening lamp tube 201 not from the lamp socket 204 drawn.

The pressure element 401 is as a mechanical spring 405 formed and made of spring steel. Due to the electrical conductivity of the mechanical spring 405 In addition, the electrical connection between the contact element 101 of the connection area 102 and the driver electronics 402 guaranteed.

5a and 5b show a sectional view of a socket with pressure element and lamp tube, inserted into a lamp according to a fourth embodiment.

In this embodiment, the connection area is 102 directly with the attachment area 104 of the pedestal 100 connected. At the open end of the attachment area 104 is a catch 502 over the entire inner circumference of the attachment area 104 educated. An end of the lamp tube 201 is at least partially in the attachment area 104 of the socket. At the inserted end of the lamp tube 201 is over the entire outer circumference of the lamp tube 201 also a catch 501 educated. By the locking lugs is a positive connection between the base 100 and lamp tube 201 educated. The base 100 and the inserted lamp tube are arranged axially displaceable relative to each other. The axial movement is in one direction by the mutual contact of the locking lugs 501 . 502 limited ( 5a ). In the opposite direction, the axial movement is limited when the end of the inserted lamp tube 201 in contact with the inside of the connection area 102 stands ( 5b ).

Inside the lamp tube 201 is a driver electronics 402 arranged, which has the same function as in 4 described. Between the first electrical contact point 403 of the contact element 101 and the second electrical contact point 404 the driver electronics 402 is electrically conductive a pressure element 401 arranged. The pressure element 401 is as a mechanical spring 405 educated.

The lamp tube 201 with the single-sided base 100 is in a light 203 arranged. The socket is over the contact element 101 of the connection area 102 electrically conductive with the lamp socket 204 in the light 203 connected.

By thermal heating of the lamp tube 201 , There is an axial thermal change in length L of the lamp tube 201 in the direction of the lamp socket 204 ; the lamp tube 201 expands ( 5b ). About the positive connection between the lamp tube 201 and attachment area 104 the lamp tube can slide according to the thermal change in length L in the socket. The pressure element is doing according to the thermal change in length L of the lamp tube 201 compressed and thus acts as a resilient area 103 of the pedestal 100 ,

In a subsequent cooling of the lamp tube 201 to the starting temperature, the lamp tube shortens 201 back to their original starting length. The pressure element 401 expands back to its original length. By the pressure element 401 will ensure that the connection area 102 the socket with its contact element 101 with sufficient force in the lamp socket 204 is held.

6 shows a double-capped tube lamp with a socket according to the second embodiment.

The tube lamp 601 is provided as a replacement lamp for conventional bi-capped fluorescent lamps and has as a light source a plurality of semiconductor light sources (not shown in FIG 6 ). The tube lamp 601 is thus as a LED retrofit lamp 602 educated. The LED retrofit lamp has a lamp tube 201 made of at least partially translucent plastic. At one end of the lamp tube 201 is a conventional socket 603 arranged for double ended fluorescent lamps. At the second end of the lamp tube 201 is a pedestal 100 arranged according to the second embodiment. The LED retrofit lamp 602 is about the contact elements 101 the two sockets with the lampholders 204 a lamp 203 mechanically and electrically connected.

In the electrical operation of the LED retrofit lamp, the lamp tube expands 201 due to the resulting self-heating out. The resilient region of the base is as a bellows 301 formed and is compressed due to the thermal expansion L of the piston. The bellows 301 completely resembles the change in length of the lamp tube 201 out. The two bases of the LED retrofit lamp are thus by the thermal change in length L of the lamp tube 201 not against the two lamp holders 204 the light 203 pressed. There is no deflection of the lamp tube 201 or damage to the lamp sockets 204 ,

FINAL FINDING

The socket for a lamp tube has been described to illustrate the underlying idea using some embodiments. The embodiments are not limited to specific feature combinations. Although some features and configurations have been described only in connection with a particular embodiment or individual embodiments, they may each be combined with other features from other embodiments. It is also possible to omit or add in individual embodiments illustrated features or particular embodiments, as far as the general technical teaching is realized.

LIST OF REFERENCE NUMBERS

100

 base

101

 contact element

102

 terminal area

103

 resilient area

104

 fastening area

105

 elastically deformable material

201

 lamp tube

202

 splice

203

 lamp

204

 lamp socket

301

 bellow

401

 pressure element

402

 driver

403

 Contact point 1

404

 Contact point 2

405

 mechanical spring

501

 Latch 1

502

 Latch 2

601

 tube lamp

602

 LED retrofit

603

 conventional socket

L

 thermal length change

S

 axis of symmetry

Claims (11)

Socket ( 100 ) for a lamp tube ( 201 ), which has an axis of symmetry (S), with - a fastening region ( 104 ) for attachment to one end of the lamp tube ( 201 ), - a connection area ( 102 ) with at least one electrical contact element ( 101 ) for electrical contacting to a lamp holder ( 204 ), - a resilient area ( 103 ) located between the attachment area ( 104 ) and connection area ( 102 ), wherein the resilient region ( 103 ) is equipped such that an axial thermal change in length of the lamp tube in the direction of the lamp holder is compensated, as far as the lamp tube ( 201 ) fixed pedestals ( 100 ) in electrical contact with the lamp socket ( 204 ) stands. Socket ( 100 ) according to claim 1, wherein the resilient region ( 103 ) comprises an elastically deformable material. Socket ( 100 ) according to one of the preceding claims, wherein the resilient region ( 103 ) a bellows ( 301 ). Socket ( 100 ) according to one of the preceding claims, wherein between connection area ( 102 ) and mounting area ( 104 ) at least one printing element ( 401 ) is arranged. Socket ( 100 ) according to claim 4, wherein the pressure element ( 401 ) as an electrically conductive element is formed and with the at least one electrical contact element ( 101 ) is electrically connected. Socket ( 100 ) according to claim 4 or 5, wherein the pressure element ( 401 ) a mechanical spring ( 405 ). Socket ( 100 ) according to any one of the preceding claims, wherein connection area ( 102 ), Mounting area ( 104 ) and resilient area ( 103 ) are formed of at least two different materials. Socket ( 100 ) according to one of the preceding claims, wherein the resilient region ( 103 ) at least the amount of thermal change in length of the lamp tube ( 201 ) in a temperature range of -20 ° C to + 80 ° C compensated. Tube lamp ( 601 ) with a lamp tube ( 201 ), wherein at least one end of the lamp tube ( 201 ) a socket ( 100 ) is arranged according to one of the preceding claims. Tube lamp ( 601 ) according to claim 9, wherein the tube lamp ( 601 ) is a LED retrofit lamp. Tube lamp ( 601 ) according to claim 10, wherein the lamp tube ( 201 ) is formed of at least partially translucent material.

Images