Lighting assemblies with heat-dissipating properties principally for swimming pools and spas
Nicheless lighting assemblies principally for swimming pools and spas are detailed. The lighting assemblies include features configured to dissipate heat. The assemblies additionally are designed to reduce possibility of water intrusion. Some versions of the assemblies may include thermally-conductive plastic overmolded onto at least one of a lens or a heat spreader. Versions of the assemblies additionally or alternatively may include a generally annular heat sink to which a printed circuit board containing at least one light-emitting diode (LED) is attached. Versions of the assemblies may be divided into subassemblies, one subassembly fitting into another, or include protective covers.
1. A lighting assembly comprising:
(a) a light source;
(b) a lens;
(c) a heat spreader; and
(d) a thermally-conductive plastic overmolded onto at least one of the lens or the heat spreader; and in which (i) the lighting assembly defines a top and a bottom opposite the top, (ii) the thermally-conductive plastic includes a first opening (A) positioned closer to the bottom than to the top and (B) through which potting material is introduced, and (iii) the thermally-conductive plastic defines a generally tubular side wall having the first opening.
2. A lighting assembly according to claim 1 , further comprising:
(a) a first subassembly comprising first and second printed circuit board assemblies and a heat sink; and
(b) a second subassembly (i) into which the first subassembly is configured to be fitted and (ii) comprising the lens, the heat spreader, and the thermally-conductive plastic.
3. A lighting assembly according to claim 1 in which the lens has a periphery surrounded by the thermally-conductive plastic.
4. A lighting assembly according to claim 2 in which the first subassembly is fitted into the second subassembly from the bottom.
5. A lighting assembly according to claim 1 further comprising thermal grease between the heat spreader and the thermally-conductive plastic.
6. A lighting assembly according to claim 1 in which the heat spreader includes (i) a second opening positioned closer to the bottom than to the top and through which the potting material is introduced, (ii) at least one first groove positioned between the second opening and the top, and (iii) at least one second groove positioned between the second opening and the bottom, wherein the first and second grooves are configured to receive the potting material.
7. A lighting assembly according to claim 6 in which the first and second openings are aligned.
8. A lighting assembly according to claim 1 further comprising a removable protective cover overlying the lens.
9. A lighting assembly according to claim 1 further comprising an annular cover comprising at least one standoff rib configured to allow water to interact with the lens for cooling.
10. A lighting assembly according to claim 9 in which the annular cover further comprises an attachment means.
11. A lighting assembly according to claim 1 in which the heat spreader includes a recess into which the lens is seated.
12. A lighting assembly according to claim 1 further comprising an end cap at the bottom and in which the end cap comprises flexible fingers.
13. A lighting assembly according to claim 12 in which the flexible fingers are configured to allow the potting material to reach the bottom.
14. A lighting assembly according to claim 12 in which the end cap further comprises a groove configured to receive the potting material.
15. A lighting assembly according to claim 1 further comprising an end cap adjacent the bottom and in which the end cap has an outermost portion to which the heat spreader does not extend.
16. A lighting assembly according to claim 2 in which the heat spreader is generally cylindrical.
17. A lighting assembly comprising:
(a) a light source;
(b) a lens;
(c) a heat spreader; and
(d) a thermally-conductive plastic overmolded onto at least one of the lens or the heat spreader; and in which (i) the lighting assembly defines a top and a bottom opposite the top and (ii) the thermally-conductive plastic includes a first opening (A) positioned closer to the bottom than to the top and (B) through which potting material is introduced; and in which the heat spreader includes (i) a second opening positioned closer to the bottom than to the top and through which the potting material is introduced, (ii) at least one first groove positioned between the second opening and the top, and (iii) at least one second groove positioned between the second opening and the bottom, and wherein the first and second grooves receive the potting material.
18. A lighting assembly according to claim 17 in which (a) each of the thermally-conductive plastic and the heat spreader has a generally-tubular wall, (b) the first opening is in the generally-tubular wall of the thermally-conductive plastic, and (c) the second opening is in the generally-tubular wall of the heat spreader.
19. A lighting assembly according to claim 8 in which the removable protective cover is removable from the lens.