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Some of the pro light kits available at B&H, etc., use 150 watt PAR38 flood bulbs. They are available for about $8.00 each from most hardware stores. Three of them will get you an inexpensive but perfectly adequate 3-point light kit. Install them in heavy duty ceramic sockets…about $12.00 each with spring clamps.
DON’T TRY TO CUT CORNERS BY USING PLASTIC SOCKETS. They don’t have either the current capacity or the heat resistance necessary for PAR38s. For that reason, they could spontaneously catch fire or fall apart.
You won’t have any dimmers with this simple setup but you can change the lighting ratios by altering the placements. Reducing the distance between the light and the subject by 30 percent (from 10 feet to 7 feet, for example) will increase the illumination by 1 full f-stop. Increasing the distance by 40 percent (from 10 feet to 14 feet) will decrease the illumination by one stop.