PC to T -5 what order??

Going from four bulb pc to four bulb t-5 I have 2 blue one puple and one coral + ATI bulbs. My fixture fires 1st and 3rd first then 2nd and 4th from front to back and are on timers so what combo order do you think?

 

personal preference in general stealhead
my preference would be to have the 2 blue/ actinic type lamps on 1st and going off last
(so maybe 12 hours of those)
with the whites, or in your case 1 white/1 purple,coming on 1 hour after and going off 1 hour before the blues (so total of 10 hours)

adjust the timings depending on how things react
corals start closing early = enough light, reduce the time
algae grows like a Bear Grylls adventure playground = reduce light

 

Good combination and Steve gave you a good system to use. I would not go longer than 10 hours with the blues and 8 hours with the whites though IME. You will need to see how your coral react. Also you will need to acclimate your coral to the light change or you will bleach and possibly kill them. Start off at 2 to 4 hours a day with your white bulbs and work your way up to your final light period by adding 1 hour per week.