I got this pre-made SM100 unit with 2 lights at the beginning of the year. I've never been able to produce much algae from it. I've cleaned the sheet 3 days ago, and this is what I got. Even I don't clean it in a week, it is just a bit thicker but still not green. I have a 125g tank with 125g sump. No coral, just 4 tangs and 6 other small fish. Feeding them a couple of times a day with frozen food and/or dry flakes.
I just recorded this video this morning: http://www.youtube.com/watch?v=0hGD0Jaxb70