I know that LED can be brighter than incandescent when designed properly. Many cars and bikes are coming with LED signals stock that meet all DOT regs and are plenty bright (including all of my cars and some of my own bikes). But all of the ones that I've seen that just replace a stock bulb with a LED array screwed into that bulb mount just aren't as bright. Right behind the bike in a straight angle they are plenty bright, but just off angle they are nowhere near as bright as the original bulb. YMMV.
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