Method and apparatus for a low profile light fixture
A method and apparatus for a horticultural light for use in a horticultural facility is provided to minimize a dimension (e.g., height dimension) of the horticultural light. A sheet lens is adhered directly onto the printed circuit board and optionally the underlying metallic backing plate so as to environmentally seal the horticultural light. The sheet lens is comprised of polycarbonate and is pneumatically and/or thermally manipulated to include dome portions that are disposed in proximity to the respective one or more LEDs. Light generated by the LED is incident onto the inner surface of the respective dome portion at right angles through the entire beam angle. Accordingly, substantially none of the light is reflected back into the dome, but is rather propagated to an exterior of the light.
1. A light fixture, comprising:
a printed circuit board;
an array of LEDs coupled to the printed circuit board, wherein each LED of the array of LEDs is configured to produce a first light distribution;
reflective wings; and
a sheet lens including a plurality of dome portions, each dome portion having an interior surface disposed in proximity to a respective LED of the array of LEDs, wherein a distance between any point along the interior surface of the dome portion and each respective LED is substantially constant.
2. The light fixture of claim 1 , wherein the sheet lens is sealed to an outer periphery of the printed circuit board along a first surface of the printed circuit board to protect the array of LEDs from contaminants.
3. The light fixture of claim 1 , further including a metallic backing layer coupled to a second surface of the printed circuit board.
4. The light fixture of claim 3 , wherein the sheet lens is sealed to an outer periphery of the printed circuit board along first and third surfaces of the printed circuit board and sealed to an outer periphery of the metallic backing layer along a first surface of the metallic backing layer to protect the array of LEDs from contaminants.
5. The light fixture of claim 1 , wherein the sheet lens includes flat portions disposed adjacent to the plurality of dome portions, the flat portions including ridges.
6. The light fixture of claim 1 , wherein the sheet lens is pneumatically manipulated to form the dome portions.
7. The light fixture of claim 1 , wherein the sheet lens is thermally manipulated to form the dome portions.
8. A light fixture, comprising:
a printed circuit board;
an array of LEDs coupled to the printed circuit board, wherein each LED of the array of LEDs is configured to produce a first light distribution;
reflective wings; and
a sheet lens including a plurality of dome portions, each dome portion having an interior surface disposed in proximity to two or more LEDs of the array of LEDs, wherein a radius of the dome portion is substantially constant.
9. The light fixture of claim 8 , wherein the sheet lens is pneumatically manipulated to form the dome portions.
10. The light fixture of claim 8 , wherein the sheet lens is sealed to an outer periphery of the printed circuit board along a first surface of the printed circuit board to protect the array of LEDs from contaminants.
11. The light fixture of claim 8 , further including a metallic backing layer coupled to a second surface of the printed circuit board.
12. The light fixture of claim 11 , wherein the sheet lens is sealed to an outer periphery of the printed circuit board along first and third surfaces of the printed circuit board and sealed to an outer periphery of the metallic backing layer along a first surface of the metallic backing layer to protect the array of LEDs from contaminants.
13. The light fixture of claim 8 , wherein the sheet lens includes flat portions disposed adjacent to the plurality of dome portions, the flat portions including ridges.
14. The light fixture of claim 8 , wherein the sheet lens is thermally manipulated to form the dome portions.