High Efficiency BLF Switching Driver? - Request for Desired Features

How efficient can a buck/boost be these days? I thought the extra components chewed up enough energy to make it not worth doing.

It does seem to be the perfect driver for Clemence’s latest project. Nichia NF2W757GR-V3 [GRV3]

I’m trying to find a good way to run one of those emitter boards off of a 2.5a usb port, hoping to put it in a cheap 10 watt floodlight housing. This might be the perfect driver for it.

How hard would it be to put the mcu on a smaller board or make it so a different mcu on an adapter board could be soldered in place of the original?

Set it up with the 85 as a base, and have the ability to use the 841 and whatever you wind up using for the sound activated driver and the microphone. Or maybe check with Toykeeper to see how she’s doing with the 841 and skip the 85 altogether.

The FW3A might be a bit of a challenge for you. I does not deal with heat that well and there won’t be much height for the inductor.