If you have access to some aluminum plate stock for cheap, look at building one out of strips. That’s what I did and it is comparable performance to a QB for less outlay of $$.
It might behoove you to get current on what is available: MH/HPS, LEC, LED etc. If heat is an issue then the LED’s are the way to go. Also; there’s “throwing good money after bad” with LED’s: I ditched $700 worth of lights to get GOOD lights. An expensive lesson.