I have a lamp connected to a UPS and I was curious about how that influences different lightbulb technologies. In my case it’s one of those curly CFL bulbs.
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It won’t
Square contains much energy in the higher frequencies. Not just your 50 or 60 Hz, but a multiple thereof.
If the bulb isn’t just a bulb, but has lots if electronic circuits inside - for example, a smart bulb, or an LED bulb for high voltage - then that circuit may (or may not) break after some time.
Probably not.
For an incandescent, I’m sure it won’t. But a CFL will have an electronic ballast, and at least theoretically, something in there might not like it.
