I finally found a bigger tank and I will be upgrading to a 210 gallon RR tank shortly. I had hoped to be able to use my current 4' TEK (6bulb) outfit but of course 4' won't be adequate for a 6' tank. I cannot add another 2' of T5 lighting without retro'ing a 6 bulb configerationand that really isn't going to be cost effective or a good solution. I hadn't wanted to go with MH's because of the cost and heat issues but since I'm going to be starting from "GO" here, I thought I'd at least consider it. Also, the canopy on my "new" system has 5 fans built in. The previous owner did use MH's. I know NOTHING about MH's except that I like the Lumen Bright reflectors. What brands and watts would you recommend? I like a little bit of a bluer look but I don't want a really blue lighting. I really don't want to get into something that's going to cost me an arm and a leg per month in increased utility costs. Are there any that are a little more consumer friendly?? Any personal preferences and suggestions welcome!! Thanks in advance.