Does anyone have any experience in building a voltage regulator for 220 VAC and with a capacity of 500 Watts, or possibly 1 KW? I am using two sets of 4 x 40 Watt fluorescent lamps via a fluorescent lamp dimmer to illuminate newspapers that are being microfilmed. The trouble being that every time an airconditioner starts or stops the current going to the lamps varies. Is there any way of building an electronic dimmer for the fluorescents with a built-in regulator so that once the current reading on the multimeter is set it will be stabilised whatever else is running on the same circuit? The fluorescent dimmer I'm using at present was built about twenty years ago. Would be grateful for any advice or practical circuits.