A rapid start circuit for starting and step dimming a fluorescent lamp includes a voltage step up auto transformer and lamp filaments for starting, ballast and a pair of capacitors having different values variously connected in series with the lamp and ballast by a rotary switch; first in parallel, then...http://www.google.com/patents/US4559479?utm_source=gb-gplus-sharePatent US4559479 - Starting and dimming circuit for fluorescent lamps
