CONSTANT LUMEN OUTPUT CONTROL SYSTEM

摘要

A constant lumen output control system for providing a constant lumen output
throughout the life of a lamp at the mean or preset lumen level . The lumen
con system (315) coupled to a lamp driver (310) initially reduces the power to
the lamp (330) to prevent the lamp from being operated at power levels that
result excess mean or preset lumen levels. With increased lamp usage, the
lumen contr system gradually increases power to the lamp to compensate for
lamp lumen depreciation due to light-reducing mechanisms. By compensating for
lamp lumen depreciation the lamp is operated at a constant mean or preset
lumen output throughout the life of the lamp.