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Incandescent light bulbs are officially banned in the U.S.
(www.digitaljournal.com)
This is a most excellent place for technology news and articles.
Thought LEDs can do this too
No/it depends on the board design.
Even if it’ll give you different brightness the behavior in weird conditions is different and it’s not diagnostic or protective and you can’t drop in lower wattage bulbs for testing and tv work.