US 6,982,529 B2
Method of lamp replacement warning for image projection lighting devices
Richard S. Belliveau, 10643 Floral Park, Austin, Tex. 78759 (US)
Filed on Dec. 31, 2003, as Appl. No. 10/750,398.
Application 10/750398 is a continuation in part of application No. 10/360185, filed on Feb. 07, 2003.
Prior Publication US 2004/0155597 A1, Aug. 12, 2004
Int. Cl. F21V 33/00 (2006.01)
U.S. Cl. 315—316 8 Claims
OG exemplary drawing
 
1. An apparatus comprising
an image projection lighting device comprising:
a base; a yoke;
a lamp housing;
the lamp housing comprising
a lamp,
and a first light valve;
a communications port;
a processing system;
a memory;
wherein a cutoff value representing an amount of accumulated operating time at which the lamp begin to operate improperly is stored in the memory;
wherein an accumulated value representing an actual accumulated amount of operating time of the lamp is stored in the memory;
wherein the processing system prevents the lamp from operating when the accumulated value is within a limit of the cutoff value, unless the processing system grants a request for a variance;
wherein when the processing system grants a request for a first variance, the processing system allows the lamp to operate after the accumulated value is within the limit of the cutoff value.