I am looking to switch from MH to T5. I have a 3 bulb 150 watt metal halide fixture with individual reflectors and ballasts. Its got legs that mount it to the tank. Also has built in cooling fans. Also have 2 2 bulb t5 24" fixtures that I use to supplement actinic. Like to trade it all for a t5s that will cover 72". Bulbs are all under 6 months old.