The grow lights turn off at 7pm after being on for 12 hours. not a lot of light hits it and by the sound of it, it should be fine.
for anyone wishing to do a little bit of DIY to ensure proper darkness; someone gave me the tip to cover a corner of one of the milsbo shelves from the inside with something like cloth or aluminium foil, shielding it from any light. If all else fails, i guess for anyone growing these, then i guess that would solve it!