I know that you're not picking on me and that they can be used on tanks taller than 18" but, I still PREFER MH on tanks taller than 18". Part of the reason is because of the penetration that MH provide and part of the reason is that you loose the shimmer with T5's that MH bulbs provide.
BTW, here's a quote from the TOTM winning tank posted above.
Quote:
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One of the keys to getting good results with T5 bulbs, I believe, is to keep your SPS no more than 18" from the light source. For intensely colored SPS (i.e. reds, blues, pinks, neon yellows), I keep them less than 10" away. The T5 bulbs are no more than three inches from the water surface.
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BTW- He has 8-54w T5 HO bulbs over his 22" tall tank and he runs his lights 11 hours per day. How many people do you know that run their halides that long? I have recently increased my MH lighting to 6 hrs/day, from my previous photo period of 5 hrs/day.
This is where Dale steps in on Jim's side. I can't make this conversation too easy for Jim and Dale to make their point.