Any of the lighting systems that are suitable for reef tanks are going to use a considerable amount of electricity and give off a considerable amount of heat. You may hear that PC
's and VHO
's run cool. IF they have proper ventilation, they won't cause your tank to overheat. A PC
bulb, after it has been on for a few minutes, will burn you.
I think there are some MH
fixtures that are "low profile". I'm thinking it's called a Reef Sun or a Reef Star? Can't remember...perhaps someone else can comment further on that.
You could, as an alternative, use an Icecap 430 and three 110 watt 4' bulbs. You might, if you use the double endcaps, get 4 VHO
bulbs over your tank which would give you 440 watts. That would require the Icecap 660 ballast. I just ordered an Icecap retro kit from www.championlighting.com
for a 4' tank. 660 ballast, 4 bulbs, standoffs, endcaps, and fans...about $400.00. They also have MH
lighting although www.ahsupply.com
is probably a less expensive alternative for PC
. You might also check out www.hellolights.com