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cody6766 · 07/15/2011, 08:54 AM

I'd light it with a 150w if it's a 20H, and maybe a 20L. For a 20L, I'd lean towards a pair of 70w MH for more even coveage. It can be done with a single 150, but you have to put it pretty high.

If you plan an upgrade sometime down the road, consider the 250w, but it's definitely not necessary. I tend to think about future-proofing my buys. I'll pick up something a little more than I need if there's a way to throttle it back, just in case I upgrade

07/15/2011, 08:54 AM	#10
cody6766 Super Best Friends! Join Date: Jan 2008 Location: OKC, OK Posts: 3,772	I'd light it with a 150w if it's a 20H, and maybe a 20L. For a 20L, I'd lean towards a pair of 70w MH for more even coveage. It can be done with a single 150, but you have to put it pretty high. If you plan an upgrade sometime down the road, consider the 250w, but it's definitely not necessary. I tend to think about future-proofing my buys. I'll pick up something a little more than I need if there's a way to throttle it back, just in case I upgrade __________________ "The moral is the chosen, not the forced; the understood, not the obeyed. The moral is the rational, and reason accepts no commandments." - John Galt Current Tank Info: Cadlights 60G Arisan II mixed reef with 2x MP40s and 24" ATI