Light reflectant surface in a recessed cavity substantially surrounding a compact fluorescent lamp
First Claim
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1. A method of providing improved diffuse reflectivity of light in a luminaire containing a lamp comprising;
- providing a reflectant material comprising a structure of expanded polytetrafluoroethylene having polymeric nodes interconnected by thread-like fibrils emerging from the nodes and defining microporous voids therein, with the reflectant material having a diffuse reflectance of greater that 94%;
mounting the reflectant material in a recessed cavity of a luminaire to substantially surround the lamp so as to cause light energy to reflect off it;
the recessed cavity having an aperture to depth ratio of equal to or less than 2.0.
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Abstract
The present invention is an improved reflector for use in a compact fluorescent lamp (CFL) luminaire and a luminaire incorporating such a reflector. The present invention achieves significantly improved light output from a CFL by employing a reflector of expanded polytetrafluoroethylene. Not only is light output improved over presently employed CFL luminaire reflectors, providing more light and/or allowing for less energy usage, but the luminaire of the present invention also produces a more pleasing light output.
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Citations
25 Claims
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1. A method of providing improved diffuse reflectivity of light in a luminaire containing a lamp comprising;
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providing a reflectant material comprising a structure of expanded polytetrafluoroethylene having polymeric nodes interconnected by thread-like fibrils emerging from the nodes and defining microporous voids therein, with the reflectant material having a diffuse reflectance of greater that 94%; mounting the reflectant material in a recessed cavity of a luminaire to substantially surround the lamp so as to cause light energy to reflect off it; the recessed cavity having an aperture to depth ratio of equal to or less than 2.0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A luminaire comprising
at least one lamp mounted in the luminaire; -
at least one sheet of expanded polytetrafluoroethylene (PTFE) comprising a structure of nodes interconnected by thread-like fibrils emerging from the nodes and having a reflectance of greater that 94%; mounting the reflectant material in a recessed cavity of the luminaire to substantially surround the lamp so as to cause light energy to reflect off it; the recessed cavity having an aperture to depth ratio of equal to or less than 2.0. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A luminaire comprising
at least one compact fluorescent lamp mounted in the luminaire; -
a reflectant cavity comprising expanded polytetrafluoroethylene having a structure of polymeric nodes interconnected by thread-like fibrils emerging from the nodes and having a reflectance of greater than 94%; the reflectant cavity of the luminaire substantially surrounding the compact fluorescent lamp so as to cause light energy to reflect off it; the reflectant cavity having an aperture to depth ratio of equal to or less than 2.0. - View Dependent Claims (24, 25)
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Specification