Still haven't used a cmh but I know the hlg QB is better than the blurple led and cfls I used in the past.You should get a lot faster growth with the 4k 315 cmh. I cut 2 weeks veg time off from 600mh use.
I still like cmh performance and color. Timber is popular and people i know build great kits .. Im not gonna go all best in the world on it though.@GT21
Iirc timber are top quality. All others, unless built by gt, may not be up to par.
Would this be the bulb you recommend?4k will work, see my 4k vs 3k cmh thread