The reasons I chose T5's over MH are:
1. Perceived safety, less risk of a fire.
2. Lots of MH ballasts are said to make a loud humming noise.
3. Not particularly interested in SPS.
4. I wanted an open-top tank with pendant lighting and the MH pendant units I researched were said to cause light spillage/glare into the room.
The things I don't like about my T5's are:
1. Cost, probably more than MH when you include bulb replacement.
2. Bulbs are hard to find in Canada.
If I had to do it again I would get MH because there is no real difference on price and MH leaves more options open in the future. Still I am happy enough with my T5's for now.
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