At what age do you go from floros to HPS?

At what age do you make the switch? Thanks

Whenever your plant starts to get pre-flowers. Pull the ones with male pre-flowers and put the girls under the HPS 12/12. Heres a good link with everything you need to know:
http://www.420magazine.com/forums/budding-cycle/81272-female-pre-flowers-flowering.html
Good luck!

my plants are only 9 days old and have been under the hps since they were 3 days old