Live Stoner Chat Question: can I take a 7 week auto from 13 hours light to 18 without harm?

[jitsman71]

I have 3 NL Autos that are 7 weeks. I started them on 13 hours light but I would like to go to 18/6 to increase yield. I have them in a greenhouse for 10 hours sun and supplement with 3 hours CFL at about 7500 lumens. The reason for only 3 hours is I have a makeshift indoor grow. I just need to know if I can take them to 18 hours without screwing them up....thanks

 

[namvet25]

No problem.Next grow try and give them at least 18 hrs from start to finish.