I bought a couple ballasts on e bay and am trying to work out the hook up. It came with a mongol base but i prefer hqi, is there any reason i couldn't change it? what is every ones opinion on changing it? I have noticed that the cost of hqi is less and they take up less space in the hood? My next question is can you have too much light in a tank? I have 4 96 watt vho's now and i am going to add 2 250 watt halides. That will be almost 10 watts per gallon, is that too much?