Many of these new high output LEDs are not simply LEDs, they have a control ckt built in. Much would depend on the tolerance of this ckt. You could just go for it and get the biggest cap you can fit. The big ones have screw terminals. You can't hurt anything but your wallet by going too big. If there is no controller then a filter cap would not matter much at higher RPM. Being these are only 3W each emitter perhaps they are cheap and simple, also maybe not so bright. My lights were close to $100 each with a much more sophisticated single 10W emitter and controller, VERY bright for a single light. I find it hard to beleive you will get the same for $30.
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