Low Voltage Ceiling Light For Camper

currently working on updating the lighting in my trailer, I live in it full time and am preparing to go ff grid, so these will be eventually powered off of a pretty large sized 3.4V battery. each one takes 6 COB mounted star leds. which puts them at around 13.86W per assembly. they are attached with 3mm screws, i just happened to have a bunch of old computer case screws around but lowes sells 3mm x 5 mm which is about what you would need. i picked up the leds for a song something like 5$usd with