Patent ID: 7759854
Filing Date: 2010-07-20
Classification: H05B,Y02B

Abstract:
1. A white-light electro-luminescent lamp having an adjustable spectral power distribution, comprising: a. a first light-emitting element which emits light within each of three wavelength bands, including a first wavelength band between 440 and 520 nm, a second wavelength band between 520 and 600 nm, and a third wavelength band between 600 and 680 nm wherein an integrated spectral power of the first wavelength band is higher than the integrated spectral power of the second wavelength band and the integrated spectral power of the second wavelength band is higher than the integrated spectral power of the third wavelength band; b. a second light-emitting element which emits light within each of three wavelength bands, including a first wavelength band between 440 and 520 nm, a second wavelength band between 520 and 600 nm, and a third wavelength band between 600 and 680 nm wherein the integrated spectral power of the third wavelength band is higher than the integrated spectral power of the second wavelength band and the integrated spectral power of the second wavelength band is higher than the integrated spectral power of the first wavelength band; and c. a controller that modulates the integrated spectral power of the light produced by the first and the second light-emitting elements such that the spectral power distribution of the light formed by combining the light produced by the modulated first and second light-emitting elements is substantially equal to a CIE standard daylight spectral power distribution for correlated color temperatures between 4000K-9500K.