Ok my plants are two weeks old today and about 4 in tall. Today the power went out and blew my 400 watt MH bulb Im so pissed cause everything was going so smoothly til now. n e way I have a new 400w hps bulb i was waiting til flowering to use. Can i use it now on young plants w/o burning them or something worse? Also what will 6hrs of darkness do to premature plants? Any imput is welcome as this is my 1st grow. thanks for looking