like what? lux or par meter to check the intensity. Mix your color bye eye. set the ramp according to your sched in life. I have a kinda stupid long lights on, but its almost no light for the first and last hours. 8 hrs at peak.(if you do the math and get up early and work long days like I do its actually the same time intensity as a summer day) keep in mind lights just used to come on. MH. and the reef looked great. the only concern IMO is too blue. I believe at a 1:1 the native color on the SB is 16K. and that.