I am currently changing it. I think the VHO will be on 12 hours and the mh will be on a total of 8 - 2 20K 400, 2 20 k 400 & 10 k 250, 2 10 k 250 and 2 20 k 250. And, I will be changing bulbs ever 6-8 months to see if that minimizes the PAR shock when I change bulbs.