not sure what is meant by the disco ball effect. Are you saying you'll getting coloured spots on stuff in the tank?

Pretty much. If you look closely at some areas, you see flickering of blue and white. Almost a strobe effect.

I'll try to take a video of it and post it. I don't really notice the flickering, maybe its because I have a few more units on the tank then what most people would use.

apexfd is running 3 out of 4 on his tank, I will ask him to chime on this topic.

When I first set up my tank with the Sols I didn't see any disco ball effect but after I put a glass lid on the tank there are a few spots with this effect. Mostly in shadowy spots from rock overhangs. The condensation bubbles on the glass are what is causing it in my tank. Two years ago I did see a tank with LEDs and I started getting a headache after looking at it for just a few moments. It took me 2 years after seeing this to consider trying LEDs on my own tank. For this reason I went with the cheaper Sols in case I hated the lights but it is really nice and I have great bright coverage and I'm only up to 60% so far.

I think the Radions have a disco feature lol
http://www.youtube.com/watch?v=kd4U5M4t_IU

:rainbowa::smilecol::laluot_22: