01-11-2012, 07:07 PM
Join Date: Jul 2010
Location: Dallas, Texas
| | Re: Best Lighting for a 40b?
For low to medium light, two T5 NO tubes or one T5 HO tube should do it. I run 2 NO tubes over my 40 gallon, suspended about 4" above the top, and get about 45-50 umol of PAR at the substrate, which puts me in medium light by most definitions.
Surprisingly, I get more PAR when I use 4100K Phillips daylight tubes from Home Depot than with 6700K Coralife tubes. The Coralife tubes only give about 30 PAR, cost more than twice as much as the Phillips, AND only last about 6 months! So sometimes cheap and easy is better.
I also have very good results with spiral compact fluorescents mounted vertically over a 20 gallon tall that is the same height as the 40b. In this case two 26w 6500K Sylvania spiral CFs produce about 60 umol of PAR at the substrate. These also come from Home Depot, and cost about $6 each.