forget the LED's, for the next decade or so any way.
a single 600w hps, or dual 400's isn't that costly to maintain, and well worth it, and any extras. my cool-tube rectangular box reflector, is able to be kept around 15" from the canopy, the 6" 24w fan was maybe $35.
my 400w halide is in an open aluminum wing reflector,
i just use an ordinary panning fan, or a little holmes cyclone.
if you are in a sealed environment or using 1kw lights things can get pretty involved, but in a tent, cab, closet, or spare room; youll be fine with most hardware you have at home already.
finding a nice PPM, EC, TDS, TEMP, PH meter is a good idea, thats one of the gadgets worth investing in once you decide growing is for you,,, or is a medically necessary. i have a NZ Hydroponics/Blue Labs ppm/temp meter, which has a 5' cable with a carbon meter that is to be left submerged in the rez, it has an alarm for if the ppm's sway by .5 from the set rate.
very simple, but $450, it connects to a mother board which is astronomical and for large green houses, so the gave it to me for 50...whos gonna be running that sort of system anyway?!?
so looking for a deal on a quality meter will make your life much much easier, grow healthier plants, know how much you are actually feeding/they are eating, and keep then alive,,, these things prevent lock-out, and other sudden death mishaps.
with hydro, if anything goes wrong, its going to go wrong fast, but the signs/symptoms show quickly and correcting them can be done in near real-time.
with soil, if anything goes wrong, its going to happen quietly and slowly, once the signs/symptoms do arise, they will be more progressed late stage symptoms.
ebb & flood with a 400w halide, then soiless drip with a 600w or 2 400w MH & HPS; with mh/hps the plants will continue growing (roots, leafs/chlorophyll, stems), and producing resin/flowering.