Mike,
I saw in your signature that you are running a 24" infinity along with 2 LEDS? I am having a custom tank designed at either 42" or 44" L X 24" X 20". It's in a small room with a second tank next to it and I want to avoid running a chiller. My idea was to go with a 24" Spectra and place a Kessil on each end to give a bit extra light and dawn to dusk. How is your setup working and are you happy with it? I'd like to avoid running a chiller and that is the main reason I have focused on a single 250 W MH lamp.
Best,
Chris