Wow! I finally found your thread. I dealextreme link did not work. What Cree LEDs are you using? color? wattage?
BTW...I am getting my LEDs over this weekend. So hopefully I will have my fixtures ready for use by Monday and can help you with some practical data.
I could not find in your designs, how high you are planning to mount the LEDs, above the tank. Since you have a deep tank(20"), I think you should calculate the lux on the substrate surface based on the distance. I reflector might also be a good idea for restricting light to be wasted outside the tank, unless you have a hood to mount it in.
Anyways, looks good so far. I am subscribed.
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