If you check out my friend TomR's 180g & 6' 120g reef tanks, he converted a couple years ago from Metal Halide to LEDs and has never been happier. His corals are amazing and growth & colour are phenomenal. Mix of SPS, LPS & softies. Whenever we meet, he comments on how he loves no longer spending $600 on replacing his halides and another couple hundred on T5 bulbs every Boxing Day. I used to have a total of 10 MH (3x250w and 7x150w) at my peak volume (almost 1000g of sw tank total volume), and my hydro bill dropped tremendously when I downsized and converted all my lights to LED. I prefer the movement of LPS corals anyways, but that mainly means my LEDs are never at full 100% power (adjustable lighting intensity is another major advantage to going with LEDs).