Usually a cannabis plant will show sex around 37-46 days after sprouting, without doing the 12/12 light cycle, if you have a few light leaks along the edges of the grow tent or closet grow, it will be fine, just do not open the doors while the lights are off, or when its time for their dark cycle. One led is sufficient enough of up to 6 plants under a 300w led. I am currently growing 6 plants in a 3x3 tent and they are exploded, dont assume all led model lights are lame and will yield you little bud, i yielded 6 ounces off of my 300w GalaxyHydro full spectrum led(135w actual power used), it's just hype cause people are used to old school technology(HID), they're not wanting to switch over to new technology grows imho.