Well I got my 2-120 watt led light for my 55 gal aquarium last week and wow....So many problems solved...Why would someone buy an aquarium chiller....Led lighting took care of my overheating problem matter of fact my heater is running all day and night.. The t-5s I was running made my temp fluctuate at least 5 degrees a day now my tank stays at 80 degrees no fluctuation...I could not imagine what metal halides would do And my corals are very happy the light actually reaches the sand bed you can see the ripples from the surface on the sand bed... Plus these leds last approx 50,000 hours....Wow no bulb changes that can save up to $120-$150 a year on bulbs..leds pay for themselves in approx. 3 years.. My Led lights cost $300 you cant beat that.. Wish I knew this before I bought the T-5 lights...