Don't forgot those pesky bulbs that only last a few grows!! You're looking at a 40% cost savings on electricity alone when switching to led. That's a LOT over a 1 year period. And don't the big lights require some kind air flowing through the hood? More juice and space there. Watts means heat regardless. I mounted my drivers outside of my tent to reduce heat, but if you need heat, leave them in, and run a fan across them to circulate the warm air.
I'd go with
@ilovereggae suggestion, bunch of qb120 boards from HLG. Great service, great product, killer bang for your buck, and they don't require a heatsink
Mine have been on every single day for 18 months without issue, I love them. Gonna buy more when I build my next light.