US 7,550,910 B2
	Fluorescent lamp with barrier layer containing pigment particles
Jon B Jansma, Pepper Pike, Ohio (US)
Assigned to General Electric Company, Schenectady, N.Y. (US)
Filed on Nov. 08, 2005, as Appl. No. 11/269,318.
Prior Publication US 2007/0103050 A1, May 10, 2007
Int. Cl. H01J 1/62 (2006.01); H01J 63/04 (2006.01)

U.S. Cl. 313—489  [313/484; 313/485]

16 Claims

1. A mercury vapor discharge fluorescent lamp comprising a light-transmissive envelope having an inner surface, means for providing a discharge, a discharge-sustaining fill sealed inside said envelope, a phosphor layer inside the envelope and adjacent the inner surface of the envelope, and a barrier layer between the envelope and the phosphor layer, said barrier layer comprising alumina particles and pigment particles, said pigment particles being greater than 0.01 and less than 25 weight percent of said barrier layer, said barrier layer being substantially free of a phosphor, and said barrier layer having sufficient pigment particles such that the presence of the pigment particles in the barrier layer increases the CRI value of the lamp by at least 1.