questiong about flowering

In flowering progress supposly no light is allowed in dark hours, is there a problem that some light can go in from a little gap in my closet? the gap is the door where it closes at, do i have to cover around the door? or i am just turning psycho here?

stop any light leaks or risk problems

You can tape a border of plastic around the door so it's light tight when the door closes and the plastic then covers the gap, that never hurts.

If you get in the closet and close the door and it's not dark, fix it, but don't seal it off from fresh air getting in too.