03-07-2010, 09:55 PM
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Originally Posted by poolman84
1 T8 8,000k 15w. I added another 15w T8 6,700k that was full spectrum and that's when I started getting super fast algae growth, so I just use the first one now. It's lower light that's "bluer". I generally keep it on from 8 to 12 hours a day depending on my work schedule. Planning on getting a timer soon.
The 6700k in my view is the light that should be kept on as it's a better light for plant growth. Important to know is the spectrum intensity of these 2 lights, as to what they may be. I would also ask for how long you had this here bulb the first one in question as usually most bulbs start losing their intensity anywhere from 9-12 months. That is when these lights should be replaced for planted tanks hope this will help you.