LED light source

1. An assembly comprising:

(a) a shelf comprising a recess and a longitudinally extending light guide, the light guide having an upper surface, a lower surface, a front side, a rear side, a first opposed side and a second laterally spaced apart opposed side, at least one of the upper surface and the lower surface having a plurality of light emitting locations, a substantially rigid cartridge that is removably positionable in the recess, the cartridge comprising a heat sink and at least one LED;

(b) the energy storage member is operatively connected to the at least one LED in a first mode in which power is supplied to the at least one LED and a second mode in which the at least one LED is off; and,

(c) a sensor operable to detect when a door is in an open position and, when the door is in an open position, the energy storage member is operatively connected to the at least one LED in the first mode

wherein, when the cartridge is positioned in the recess and the energy storage member is operatively connected to the at least one LED in the first mode, light emitted by the at least one LED is directed into the light guide.

2. The assembly of claim 1 wherein the energy storage member comprises at least two batteries and, in the first mode, two or more of the batteries are connected in series.

3. The assembly of claim 1 wherein the sensor comprises a motion sensor.

4. The assembly of claim 1 wherein the sensor comprises a light intensity sensor.

5. The assembly of claim 1 wherein the sensor is part of the shelf.

6. The assembly of claim 1 wherein the upper surface of the light guide is an upper surface of the shelf or the lower surface of the light guide is a lower surface of the shelf.

7. The assembly of claim 1 wherein the lower surface of the light guide is a lower surface of the shelf.

8. The assembly of claim 1 wherein the upper surface of the light guide is an upper surface of the shelf.

9. The assembly of claim 1 wherein the upper surface has a plurality of light emitting locations.