10-10-2012, 12:23 PM
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Originally Posted by jentralala
The hood on my tank will only fit a 24" light. The only light in my LFS that is that length (Zoo Med Flora Sun) has only 18 watts. This is really low for my 40 gallon, but my tank is in a room that can get a decent amount of sunlight if I open the curtains. Will this be enough light for a low light tank? I absolutely cannot afford a longer hood for my tank.
The "watts" is meaningless, as only T8 (or T12) tubes will fit the fixture and they will all be roughly the same wattage as that is how they are made. We look for a good spectrum tube, and that suffices.
The UltraSun that Quantum mentioned is a good tube; another identical is the Hagen Life-Glo with 6700K. These are m ore expensive though, and if you want you can go to a hardware-type store and buy "daylight" tubes having a 6500K that will be just as good for a fraction of the cost. Take your existing tube with you just to ensure you buy the correct length, that is all that matters, and the one with 6500K. GE, Phillips and Sylvania all make them.