Well, I typically run an update around spring time, when the sun gets a little higher in the sky and the tubes fill up with natures rays
It's been almost 4 years of having these installed over my reef and a couple observations:
1.) 10" tubes are probably a bit undersized for thsi application. I would design 14" or larger diameter tubes into a future build if I were to do it over.
2.) It is tough for me to get a real good definative answer on whether or not my little Science experiment with Solar Tubes in Richmond, VA over a reef tank is a flying success due to all the other requirements of reef keepeing (Water Flow, Chemistry, Temps). There are so many vairables that what appears to be a light issue could very easily be masked by a excessive nutrient issues, lack of flow issue, low Alk issue, pest issue, etc.
3.) There is no doubt in my mind that all my reef inhabitants love the natural sunlight. The biggest issue for me is the late fall and winter months when I get very little light through them, so I must have some supplimental light. For me it is (04) 54 watt t5's and (02) Led Par 38 spots.
So enough chat... Here are some updated photos of my reef. Granted not perfect, but growing. I did recently add a sulpher denitrator after finding out my Nitrates had climbed up to excessive levels (Greater than 25

) Reason I mention this is that I hope my next update will sow some real nice improvement.
Pictures next thread...