They look great. You can still reach th same DLI in 12 hours. Just add more lights :) nevermind the heat.. but serious, you could feasibly provide the same energy as others do in 18 or 24 hours, but in 12-13.
one thing, i fyou ever get photos, can you keep at least a cfl or something for a couple hours? otherwise, you may need to stick to autoflowers only or 12-12 from seed only photos. Heh, they'd probably finish around the same time, i bet.