Lamps for enhanced optical brightening and color preference
View Patent ↗In an embodiment, the disclosure provides a light source comprising at least one solid state light emitter. The light source, in operation, emits substantially white light having a Lighting Preference Index (LPI) of at least about 105, and this emission from the light source comprises a UV-violet flux of at least about 1%. Use of the lamps, light sources, and methods of the present disclosure may afford the ability to display linens and clothing under energy-efficient LED-based illumination, and may impart an effect to (especially white) clothing, that makes them look cleaner than under illumination by prior art LED lamps.
1. A light source comprising:
a light engine comprising an array of at least one blue LED chip and at least one solid state UV-violet light emitter comprising a peak emission at a wavelength of about 380 nm to about 420 nm,
the array coated on at least a portion of an emitting surface thereof with a phosphor composition, the phosphor composition configured to not appreciably absorb light from the at least one solid state UV-violet light emitter,
the light source in operation emitting substantially white light having a Lighting Preference Index (LPI) of at least about 105 and comprising a UV-violet flux of at least about 1%.
2. The light source in accordance with claim 1 , wherein the UV-violet flux is at least about 5%.
3. The light source in accordance with claim 1 , wherein the UV-violet flux is at most about 30%.
4. The light source in accordance with claim 1 , wherein the LPI is at least about 110.
5. The light source in accordance with claim 1 , wherein the LPI is at most about 145.
6. The light source in accordance with claim 1 , wherein the at least one solid state UV-violet light emitter comprises one or more of LED chip, LD chip, inorganic light emitting transistor, organic LET chip, or OLED panel.
7. The light source in accordance with claim 1 , wherein the light source is a lighting module comprising a light engine on a supporting structure.
8. The light source in accordance with claim 1 , wherein the light source is a lamp and/or luminaire comprising a lighting module.
9. The light source in accordance with claim 1 , wherein the light source is a lighting system comprising a plurality of lamps or plurality of luminaires.
10. A light source comprising:
a light engine comprising at least one solid state light SSL emitter, the light engine in operation emitting substantially white light having a Lighting Preference Index (LPI) of at least about 105, wherein the light engine comprises a blue LED in combination with a plurality of encapsulated phosphors, wherein the plurality of encapsulated phosphors comprises at least one yellow or yellow-green phosphor, wherein the plurality of encapsulated phosphors additionally comprises at least one red phosphor, wherein the at least one red phosphor comprises a red phosphor which substantially is not excited by and/or does not absorb UV-violet light,
the light source further comprising at least one solid state UV-violet emitter.
11. The light source in accordance with claim 8 , wherein the light source is a directional lamp, said directional lamp comprising:
a reflective or refractive beam forming optic;
the light engine in optical communication with the beam forming optic,
the phosphor composition comprising at least one yellow or yellow-green phosphor and at least one red phosphor; and
a yellow-absorbing color filter for color filtering a radiant flux from the light engine.
12. The directional lamp in accordance with claim 11 , further comprising a lens in optical communication with the light engine.
13. The directional lamp in accordance with claim 11 , wherein the UV-violet flux is at from about 5% to about 10%.
14. The light source in accordance with claim 1 , wherein the phosphor composition comprises a red phosphor substantially transparent to light emitted from the at least one solid state UV-violet light emitter.
15. The light source in accordance with claim 14 , wherein the red phosphor has greater than 50% transmittance to light emitted from the at least one solid state UV-violet light emitter.
16. The light source in accordance with claim 1 , wherein the phosphor composition comprises a yellow phosphor that does not substantially absorb the UV-violet light emitted by the at least one solid state UV-violet light emitter.
17. The light source in accordance with claim 16 , wherein the yellow phosphor has greater than 50% transmittance to light emitted from the at least one solid state UV-violet light emitter.