sarahatl, I had 3 tanks with MH and 1 with t5's before I switched to all leds over all for tanks (and refugium) 10 months ago. After an EcoTech Radion, and a couple of too cheap leds from ebay, I bought 6 fixtures for 4 tanks from EverGrow. They were quite helpful, but it helps a lot if you know about leds already. Then I switched out 3 of the EverGrow fixtures, their basic D120 with dimmers, for 3 OceanRevive Arctic S026 fixtures. They are a newer company, but I found them because they do US warranty work for EverGrow. I liked the EG D120's just fine, but the OR Arctic S026's are much better looking and after getting them, I found I liked them even more for a variety of other reasons. And they have a sponsor thread here on R2R where you can ask them questions.
If you are looking for low cost, well made fixtures with dimmers to replace your MH, I'd go with the OR Arctic S026 or the EG D120 or the Reef Breeders 'value fixture'.
If you are looking for a fixture with built-in controllers so you can do sunrise and sunset (I have these on my 2 display tanks) I'd use OceanRevive OR-IT2040 or Reef Breeders Photo16 (both made by EverGrow).
I have 2 of the OR-IT2080 fixtures over my 180g tank that had 4 250W MH and 160W of t5 before. I like the look of the tank better. I like that I can change the colors in the tank (more or less blue and white). I like the sunrise and sunset control (but I think the corals really couldn't care less). :wink: For me the biggest advantage is way, way, WAY less heat and lower cost. Remember, I have 4 tanks, 3 with MH, 2 chillers (both outside) and I live in SW Florida, so we already use a lot of A/C. My electric bills are down about $40/month on average from last summer! Between that and not buying replacement bulbs and the cost of all 6 of the led fixtures I bought will be recouped in 18-24 months!
