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. A three-way lighting system comprising:
a first light emitting diode (LED) configured to emit first light having a first spectral power distribution (SPD);
a second LED configured to emit second light having a second SPD substantially different from said first SPD;
a driver coupled to said first LED and said second LED and configured to selectively power said first LED to emit said first light and said second LED to emit said second light, wherein said driver is configured to interface with a user-operated switch to operate in at least first, second, and third modes, in said first mode, said driver is configured to power one of said first LED and said second LED, in said second mode, said driver is configured to power both of said first LED and said second LED, and in said third mode, said driver is configured to power neither of said first LED and said second LED.
2. The lighting system of claim 1 , wherein in said first mode, said driver is configured to power said first LED.
3. The lighting system of claim 2 , further comprising a fourth mode, wherein said driver is configured power said second LED and operate said first LED in an off state.
4. The lighting system of claim 1 , wherein said first light has a first correlated color temperature (CCT) and said second light has a second CCT different from said first CCT.
5. The lighting system of claim 1 , wherein said first light has a color rendering index (CRI) greater than 90.
6. The lighting system of claim 1 , wherein said first SPD and said second SPD are substantially white.
7. The lighting system of claim 6 , wherein about 4% to about 25% of power of said first SPD is emitted within a wavelength range from about 390 nm to about 430 nm.
8. The lighting system of claim 1 , wherein said first LED comprises a violet pump LED and at least one wavelength-converting material.
9. The lighting system of claim 8 , wherein said second LED comprises a violet pump LED and at least one wavelength-converting material.
10. The lighting system of claim 8 , wherein said second LED comprises a blue pump LED and at least one wavelength-converting material.
11. The lighting system of claim 10 , wherein said second SPD is higher than said first SPD.
12. The lighting system of claim 1 , further comprising said switch.
13. The lighting system of claim 1 , wherein said switch is discrete from said driver.
14. The lighting system of claim 1 , wherein said switch is a three-way mechanical switch.
15. The lighting system of claim 1 , further comprises a retrofit lamp, wherein said first LED and said second LED are positioned within said retrofit lamp.
16. The lighting system of claim 14 , wherein said retrofit lamp comprises a screw-in socket.
17. The lighting system of claim 14 , wherein said driver is positioned within said retrofit lamp.