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Having your light closer to the water surface will help. How much is hard to quantify, especially since you will be increasing peak values, but also changing the spread. If you still get good spread in the tank, then lowering the lights will definately compensate for the loss due to the glass shield.
For the lamp data, the distance that I have used for all tests is 18". For the reflector data, the measurements were at 6", 9" and 12".
sanjay.
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