Low Cost 20W Flourescent Lamp Inverter circuit. Fluorescent lighting is approximately 400% more efficient than incandescent lighting (50 Lumens/watt compared to 12 Lumens/watt for a 100 watt tungsten lamp), although there are some losses in the ballast. A 20 watt tube (plus 10-20 watts for the ballast) gives the same light output as a 100 watt lamp, when it is heavily driven in the 240v mode.
