Or an Hps light. High pressure sodium. Not mh. Metal halide. Although some do leave there metal halide on for first week or two of 12/12 then switch to hps to cut down on some stretch.
[Disclaimer]
"I don't know everything. My opinion is just that. It's up to you to research the information offered by me or anyone else. It's not wise to act on the first opinion you get. "
What are you currently using?...if CFL's...yes, mostly in the 2500/3000 range...but a few in the 5000/6500 range could be left as well...also intensity matters as well...more watts the better as long as it matches your grow space...cheerz...h00k...