ray wu has a number of high power led with ws2811 pixel drivers attached to them.
https://www.aliexpress.com/store/group/WS2811-9W-RGB-flood-lights/701799_511806200.html
RobG may have a diy version available.
https://www.tindie.com/stores/RobG/
there is a version for a real diy on github
https://github.com/stampedeboss/PixiFlood?files=1