Cool environment lamp with anti-fog component
View Patent ↗A lamp that can be used in a refrigerated or cold environment where an overall light output measured on a target plane is not significantly reduced due to condensation or fog includes a housing including a translucent cover, an LED disposed in the housing, and an anti-fog film. The LED is disposed in the housing with relation to the translucent cover such that light from the LED passes through the cover. The anti-fog film is disposed on at least one of the surfaces of the translucent cover.
1. A lamp comprising:
a housing including a translucent cover;
an LED disposed in the housing with relation to the translucent cover such that light from the LED passes through the cover; and
an anti-fog film disposed on at least one of a light receiving surface and a light emitting surface of the translucent cover.
2. The lamp of claim 1 , further comprising a heat sink in thermal communication with the LED, a majority of the heat sink being spaced from the translucent cover such that a void exists between the heat sink and the cover.
3. The lamp of claim 2 , wherein the housing provides an enclosure surrounding the LED that allows for the ingress of air and water into the enclosure.
4. The lamp of claim 3 , wherein the translucent cover is made from a flat sheet stock material.
5. The lamp of claim 4 , wherein the translucent cover made from sheet stock material connects to and contacts the heat sink, the translucent cover being bent prior to connecting to the heat sink.
6. The lamp of claim 5 , wherein the anti-fog film is disposed on both the light receiving surface and the light emitting surface.
7. The lamp of claim 6 , wherein the translucent cover is made from polyethylene tetraphthalate glycol.
8. The lamp of claim 6 , wherein the translucent cover is made from polycarbonate.
9. The lamp of claim 1 , wherein the translucent cover is a molded or an extruded piece.
10. The lamp of claim 1 , wherein the anti-fog film is a polycarbonate film having a water absorption value of about 0.48% change in 24 hours.
11. A refrigerated display case comprising:
a refrigerated enclosure having a door opening;
a door attached to the enclosure and covering the door opening for providing access to inside the enclosure;
a lamp connected to the enclosure for illuminating products stored within the enclosure, the lamp including
a plurality of LEDs;
a heat sink in thermal communication with the LEDs, wherein the LEDs conduct heat into the heat sink;
a cover connected to the heat sink and disposed in relation to the LEDs so that light emitted from the LEDs passes through the cover; and
an anti-fog material on or in the cover.
12. The display case of claim 11 , wherein a majority of the heat sink is spaced from the cover.
13. The lamp of claim 12 , wherein heat sink and the cover provide an enclosure surrounding the LED that allows for the ingress of air and water.
14. The lamp of claim 13 , wherein the anti-fog film is disposed on both a light receiving surface and a light emitting surface of the cover.
15. The lamp of claim 11 , wherein the translucent cover is made from a sheet stock material.
16. The lamp of claim 15 , wherein the translucent cover is made from polyethylene tetraphthalate glycol.
17. The lamp of claim 15 , wherein the translucent cover is made from polycarbonate.
18. The luminaire of claim 15 , wherein the sheet stock material is flat.
19. The lamp of claim 11 , wherein the anti-fog material comprises a film having a density of about 1200 kg/m 3 .
20. A method for manufacturing a lamp for use in a cool environment, the method comprising:
placing an LED in a housing;
attaching a cover to the housing at a location so that light emitted from the LED passes through the cover, wherein the cover has been coated with an anti-fog material.
21. The method of claim 20 , further comprising bending the cover prior to or during attaching the cover to the housing.
22. The method of claim 20 , wherein attaching a cover further comprises attaching a cover that has been coated on at least two sides of the cover with an anti-fog material.