Woulodn't you just need a powerful power supply (as in a lot of amps), so it could support all the razors and the bulb at the same time. When the razors are not on the bulb wouldn't be using the whole potential of the supply, but it would still work. You would connect all the appliences with separate wires right from the power supply. I'm not really experienced with electricity, but that's how I always thought of it.
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