Method of improving low temperature lumen maintenance of an...

Details Method of improving low temperature lumen maintenance of an... Method of improving low temperature lumen maintenance of an...

H - Electricity

01

J

H01J 65/00 (2006.01) H01J 61/40 (2006.01) H05B 33/02 (2006.01)

Patent

CA 2529971

A method of increasing low temperature lumen maintenance of an electrodeless lamp whose glass body has an interior surface with red emitting Y2O3:Eu (YOE) phosphors and green emitting (Ce,Tb)MgAl11O19 (CAT) phosphors thereon, includes coating aluminum oxide directly on the CAT phosphors and/or the YOE phosphors (preferably at least the CAT phosphors). The interior surface of the glass body may also have blue emitting BaMgAl11O17:Eu (BAM) phosphors thereon. The low temperature lumen maintenance is a ratio of (a) lamp lumens at a first number of lamp operating hours to (b) lamp lumens at a reference number of lamp operating hours, when the lamp is operated with a bulb wall temperature of 35°C or lower.

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