Photo period - however long you are leaving lights on on the room. Are you leaving it on 16 hours or 24 hours or whatever. If your plants are drooping while your light is on then alot of times this is overwatering. A picture would be great. I don't think the rooting powder will not hurt so long as you did not disturb the roots. I will wait to see the picture before I say anything else.

Have fun,

Herbus