Does bud room have to be pitch black

[Dark]

If my information is right - the blooming room should be lit for 12 hours and dark for 12 hrs. Does this room have to be pitch black - or just no direct light on the plants. In my greenhouse, there is light reflecting off the ceiling above my blooming area - no direct light getting to the plants - but it is not totally dark in the area either - what do you think ---- In The Dark?