IIRC, most of the modern LEDs are being driven with about 3.3 to 5 vDC. Occasionally, they will overdrive them to get a brighter output. That comes at a cost - lower life cycle.
True for individual LEDs, but a lot of LED bulbs are an array of multiple LEDs. The actual DC operating voltage depends on how they are wired together. So a little careful testing is worthwhile. Otherwise, poof!
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