1month into grow

hey im growing big bud in my shed under a 600w dual spec light im using bio-grow soil and nuits. they are under the light for 18hours+ but i had a power cut a few weeks back and lasted most of the day so to try counter act that i kept them on for longer.

they are sitting about 7" high which i thought should have been higher.

any guidance have i fucked up lol

cheers

pics and juicy details...................

added

your fine. just tell the plants it was cloudy out.

what are your temps at in the shed?

High 20s

may want to try get your temps a little bit lower. let the soil dry a bit so they really want it. what your water schedual look like. have they took a feeding yet?

feed is every monday/thursday

overall they look healthy. if you feel your growth is slow i would spend my time focusing on the enviroment.