| If you don't plan on a chiller and are goin with 10k or lower, definitely go 250's. 400's add so much more heat. I also have noticed that double ended MH is not worth the price and heat, IMO single enders are much more economical and less a need for chiller. There was an article in advance aquarist, that tested a 175w SE to a 150w DE 10k, and the DE is hardly any better, but DE also should be further off the water (cause of the heat). In that case the results came out the same, but still keep in mind the DE was 25w less. But still I would stick to mogul end lamps. |