Patent ID: 6034471
Filing Date: 2000-03-07
Classification: C09K,H01J,H05B,Y02B

Abstract:
A fluorescent lamp providing white light comprising:a light transmissive lamp tube having an enclosed volume, and one or more electrodes in contact with the enclosed volume;a substantially pure neon fill with no mercury, enclosed in the enclosed volume, emitting an ultraviolet light and a visible light with color coordinates (P,Q); anda phosphor coating having a visible light emission with color coordinates (X,Y) excited by the neon ultraviolet emission; and the phosphor during lamp operation has a relative intensity I of the induced phosphor visible emission compared to the intensity of the neon visible emission and the combined neon visible light and the phosphor visible light has a color coordinate determined by the formula I*(X,Y)+(P,Q) that falls within the white region defined by the color coordinates {(0.310, 0.282); (0.310, 0.348); (0.453, 0.440); (0.500, 0.440); (0.500, 0.380) and (0.440, 0.380)}.