Here are some links to movies of my reef. One is of my 90 gallon reef conisting of (02) 10 Gordan Brand Tubular Skylights and (02) 54 watt T5HO's.
Jim's Skylights on Reef
Here is another movie of my Skylightoscopy... Camera lucking up the tube during sun this afternoon.. Sorry to make you guys a little dizzy, but is gives you an idea of the light coming down the tubes.
Skylightoscopy
Hope this gives everyone a good idea of what these things produce. Personally, I wish I had the 20" tubes vs the 10's...
Later,
Jim