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you get beeter results with a halide
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Where did you hear this? I've seen plenty of tanks growing
SPS out the wazoo using only T5. Also, it gets a little hot and I don't have a
chiller. I'm managing to keep the tank at 80 with a totally open top and fans on the
sump with an ambient house temp of about 74. Also, the color options are more open with T5 since you use more bulbs. If I want to change something, it's $20, not $50 for a MH bulb.
Also, since my water depth is about 19", the par values of the T5 bulbs hold up fine, it's only with deeper tanks that you need the penetrating power of MH, which is also a more focused light, while the T5 is even throughout the tank.
I did a lot of research and decided on T5s for a number of reasons, heat, cost, availability (the one
LFS that has T5 bulbs doesn't have MH products, though he can order them....I can order them myself cheaper and save a trip, whereas if a T5 goes out, I already have 4 spares and can go to the store and get another).
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with all 4 bulbs on you are pulling the same as a 150
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Actually, the 4 bulbs pull 216 watts, while the 150 MH putts out 150 watts, roughly 29% less...I could even overdrive the T5s to put out a total of 260 watts for a 4 lamp setup.