I used the Odyssea MH combo light for a little over a year. The problems started about three months after having it. The cooling fans are worthless, I had to replace them three times. I also replaced many wires, switches and connections in the ballast unit because of the ballast overheating and burning out components. Now I have Current VHOs, much better. The arguement over MH being a neccessity for some corals is valid, but I have not seen any issues with my new lights at all. Even my acro's seem more open and with more color. With the Oddysea lights I was constantly having issues with the ballast, fans and overheating. With the MH I had 9.8 watts per gallon, with the VHOs I have 8.6, but the light quality and spectrum are much better and more effecient. Save your money in the short term Oddyseas work great, but for the long haul they will burn you for even more cash. Just wish I could have posted my experience earlier, but let us know how it works out.