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If we assume that you are using a common 15 Amp lighting circuit and switch and using 120 volts to power the bulbs then you need to keep the wattage at 80% of 15 amp worse case or 12 amps.

Watts = amps x volts for standard incandescent bulbs. 12 x 120 = 1440 watts.

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Q: How many watts can you put on a light switch?
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