Adding higher wattage lights?

[Kona]

So if I am unable to raise the lights what would an ideal run time for the first little bit be? Currnetly my 175w lights are on for 10hrs. And right now i have vho atinics and the new light has 2 5ft t5's, I imagine it would be fine to run these lights with no problems? Ie. run these lights on my regular viewing schedule.
Thanx Jay