Thx im thinking of mounting the lights on the redsea mounting arms ( max. 11"i guess) reason i like these lights are the minimum light spill... you think this wil work out with the 90 deg lenses?Yes, no internet required but a wifi is. Once the lights are programed they stay in that config even if the wifi goes down. Wifi is just needed to program.
I would say yes, 2 are sufficient, 4 would be ideal. I would use the 90 deg reeflctors and mount the lights higher, say 12" plus over the water line. It has enough power and more height increase spread. The 120 lose too much light out of the sides imo. I also like having the lights mounted high so you can look top down into your tank without obstruction. I used 8020 to mount...easy peasy.
See crappy pic, I have 6 over a 48"*31" mounted 10" off the waterline and 27" off the sandbed. I run them max @ 50%. Pic looks purple but it's only royal blues on. I have used the duos, uno1 and now uno2. Best deal and light available imo. Daniel @ Reefi is hands down the best to work with.