Are you sure ? Every grow journal with led weems to have way better yield with led light.
Use both CFL and LED. Do it, be happy.
Vent the heat, but yeah, run them both.
Here's my LED + fluoros from this morning. (The plant in the front left is a newby to the flower tent, an auto, but the rest are quite mature, coming down in ~2 weeks.
You won't get a meaningful answer without sharing the light you're looking at, too much variation. I ran 2 "300W" blurple LEDs in a 4'x2' but the actual draw from the wall is 137 Watts (you'll have to measure this yourself to get a real answer, manufacturers are generally full of shit on this point) - I still supplemented with CFL. Make a good decision first, share details, put up with our elitist shit about COBs or you'll by everything more than once, like me and probably most folks here.