LED Array: The cosmetics aren't finished yet, but this is a 27-LED array based around Cree XP-G, XP-E, and XR-E stars. There are two strings of LEDs, one a mix of cool white and blue and the other a mix of warm and neutral white. Both are driven by dimmable Meanwell drivers. The heatsink is a 10" x 32" HeatsinkUSA purchase that I drilled and tapped for the LEDs. Again, time will tell how this thing performs. I'm still thinking about how to do a wood frame for this whole thing, and about whether I aim to hide the LEDs entirely from view or show them off. Many thanks to RedfishSC who gave me a lot of advice on this.