Lamp for producing daylight spectral distribution

Abstract

An integral lamp for producing a spectral light distribution substantially identical in uniformity to the spectral light distribution of a desired daylight with a color temperature of from about 3250 to about 10,000 degrees Kelvin throughout the entire visible light spectrum from about 380 to about 780 nanometers. The lamp contains a enclosed lamp envelope having an interior surface and an exterior surface, a light producing element which emits radiant energy throughout the entire visible spectrum with wavelengths from about 200 to about 2,000 nanometers at non-uniform levels of radiant energy across the visible spectrum, and at least one coating on at least one of said surfaces and having a transmittance level in substantial accordance with the formula D(L)=[O(L)−F(L)×S(L)]/[S(L)×{1−F(L)}], wherein: 1.O(L) is the desired daylight spectral output, D(L) is the spectral transmission of the coating, S(L) is the spectral output of the source, and F(L) is the likelihood of the reflected wavelength of light missing the element.