The aquarium or terrarium light systems simulates rising and setting of the sun. A housing contains two lamps, one variable lumen output for graduated light output and the other for full ON or OFF lighting. The light fixture contains a timer/dimming unit to variably increase power/voltage to the first...http://www.google.de/patents/US7436134?utm_source=gb-gplus-sharePatent US7436134 - Cyclical, aquarium and terrarium light
