I'm looking for ideas to create small, battery-powered RGBW LED lamps for stage lighting ... something like this:

https://www.thomann.de/intl/ape_labs_lightcan_v2_creme.htm

I don't need all the DMX part, or even remote control ... just 1 or 2 strong LEDs, with a switch to choose between a few color presets, and a rechargeable battery that lasts 5+ hours.

I can roughly imaging the parts I need but I wonder if anyone has a hint or experience with something like this ... which parts to use etc.