LED lamps with improved quality of light
LED lamp systems having improved light quality are disclosed. The lamps emit more than 500 lm and more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.
1. An illumination system comprising:
at least one LED device configured in a housing structure, wherein said at least one LED device comprises an n-type region, a light-emitting active region, and a p-type region, said at least one LED device configured to emit LED light having a peak emission wavelength of about 405 nm, said at least one LED device having an external quantum efficiency greater than 45% measured at an ambient temperature of 25° C. and at a current density of 40 A/cm2;
a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light;
a power source electrically coupled to said at least one LED device; and
wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a correlated color temperature (CCT) and an International Commission on Illumination (CIE) whiteness, said CIE whiteness being at least equal to a reference CIE whiteness of a blackbody radiator with the same CCT, and wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is at least 4% of said first power.
2. The illumination system of claim 1 , wherein said second power is less than 25% of said first power.
3. The illumination system of claim 1 , wherein said emitted light has a chromaticity on or below the Planckian Locus.
4. The illumination system of claim 1 , wherein said CCT is between 3300K and 5300K.
5. The illumination system of claim 1 , wherein SPD has a cyanosis observation index (COI) below 3.3.
6. The lighting system of claim 1 , wherein said emitted light has a color rendering index (CRI) greater than 90.
7. A lighting fixture comprising the lighting system of claim 5 .
8. A method of using the lighting fixture of claim 7 in a medical setting.
9. An illumination system comprising:
at least one LED device configured to emit LED light having a peak emission wavelength of about 405 nm, said at least one LED device having an external quantum efficiency greater than 45% measured at an ambient temperature of 25° C. and at a current density of 40 A/cm2;
a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light; and
wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a CCT and a CIE whiteness, and wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is a sufficient portion of said first power such that said CIE whiteness is at least equal to a reference CIE whiteness of a blackbody radiator having the same CCT.
10. The illumination system of claim 9 , wherein said second power is at least at least 4% of said first power.
11. The illumination system of claim 9 , wherein said emitted light has a chromaticity on or below the Planckian Locus.
12. The illumination system of claim 9 , wherein said CCT is between 3300K and 5300K.
13. The lighting system of claim 9 , wherein said emitted light has a color rendering index (CRI) greater than 90.
14. An illumination system comprising:
at least one LED device configured to emit LED light having a peak emission wavelength of about 405 nm;
a wavelength conversion material optically coupled to said at least one LED device and configured to emit converted light; and
wherein said illumination system emits emitted light comprising a combination of said LED light and said converted light, said emitted light has a spectral power distribution (SPD) having a peak between 390 nm and 430 nm and a valley between 470 nm and 490 nm, wherein said valley has a low point of essentially zero, wherein said SPD has a first power from 380 nm to 800 nm and a second power from 390 nm to about 430 nm, wherein said second power is at least 4% of said first power.
15. The illumination system of claim 14 , wherein said valley has a width of at least 20 nm.
16. The illumination system of claim 15 , wherein said valley has a band between 480 and 490 with an intensity of about 0.
17. The illumination system of claim 14 , wherein said emitted light has a chromaticity on or below the Planckian Locus.
18. The illumination system of claim 14 , wherein said emitted light has an R9 above 50.
19. A lighting fixture comprising the lighting system of claim 14 .
20. A method of using the lighting fixture of claim 19 in a medical setting.