Back to the OP, if you still want to build your own, I suggest:
Three of these 1 Ups, wired in series:
https://www.ledsupply.com/leds/cree-xlamp-xpg2-high-power-led
With three of these lenses and holders:
http://www.ledsupply.com/led-optics/10049-carclo-lens-elliptical-spot-led-optic
https://www.ledsupply.com/led-optics/10496-carclo-lens-holder
Driven by one of these:
https://www.ebay.com/itm/LED-driver-LD-3A-3A-12V-DC-5V-27V-for-CREE-XHP50-XP-L-XM-L-L2/113691430333?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
Mounted on a 1.75” of this:
https://www.heatsinkusa.com/3-945/
With an inch and a half of this as the bezel:
https://www.metalsdepot.com/aluminum-products/aluminum-rectangle-tube?product=292
Mount the goods to the heat sink, push the heat sink into the rectangular tube 3/8” - the thickness of the solid part of the sink - epoxy them together, drill and tap a few M3 screws around the perimeter to back up the epoxy, and put a piece of acrylic in the front with silicone.
It will draw a little under 3 amps and make about 3000 lumens in a wide horizontal flood that’s great for lighting up everything in your field of view, but not waste a bunch of light on the sky.