As far as heat goes, it can be a problem with hps and mh so you need to take that into account. I've got limited height in my grow area so I pretty much had to get a cooltube so I could get the light closer to the plants and wouldn't lose much height. But if you've got more height than me you'd probably be ok with out a cooltube (I love mine tho and for around £30 more than a standard reflector well worth it in my opinion) But a must in either case is a good extraction fan.