ive had really good results with a 125w cfl for veg. using an h.i.d. u would proobly need a squirll cage fan and they use alot more power for the 24 or 18 hour cycle for vegin. my cfl is plenty it was like 60-70 bux for the bulb 50 for the reflector. it makes a 2x3ft floor 3ft tall box explode