Just got a Nova A4 unit from them. I am a newbie at LEDs so i called and talked to Logan many times about progaming,photo period, intensity;etc. He has been so helpful. He told me never to run my unit over 60 to 70% max. I've had it 2 weeks and he said to ramp it up 10% a week until i reach 60 or 70% It is over my 30 cube and soon to go over my 60 cube. Give him a call...he is very helpful. If you don't get him live voice, leave a voicemail and he will call back. Right now my max intensity is at 30% for 2 hours a day. I start at 9:00 am channel 1 at 15 and channel 2 at 10%. I ramp up each channel 5% each hour until i reach max %,after 2 hours at max % , I ramp down the same way. This Nova A 4 is made for cubes(60 gal). This light is really super! Hope this helps. PM if you need to.