Hi,
I am using MH (main lighting) and 02 actinic blue LED. My MH will usually provide 8hrs of light while my 2 LED will only provide supplement lighting before MH starts and end.
BLUE (0800 - 1100)hrs (dawn)
MH (1000 - 1800)hrs (day - 8hrs)
BLUE (1700 - 2000)hrs (dusk)
Based on calculation, it exceeded the "between 6-8hrs" lighting requirements. Mine starts from 0800 to 2000 (12hrs). I assumed that the blue light will cause less damaging effect to the tank (i.e: nuisance algae growth) hence, it should be alright. Is it too much?