10 hrs. Halides are only on for 7.

I voted wrong. Should have been 10 hours. Forgot to include dawn/dusk :) I was just thinking Halides.

I did the same, but I have a single actinic for dawn/dusk, I can't count that as light. It's on 8am to midnight..

T5's on at 08 and off at 22
MH on at 12 off at 20

I'm trying to find the best cycle aswell... What are the Benifits to a longer day vs a shorter day?... I will have 4 t5 ho 2 are blue and 2 are white

My dawn/dusk is handled by the seasonal programming built into my apex but it basically varies it from 11 to 13 hours total over the year. I run my MH for a constant 9h/day throught the year.