@Mithridate i have some old threads or buried in some old threads some posts on LED bulb utilization and popping domes… let me find it
heres one of them, no need to go further than popping the dome. Micro Growing with Mr. Sparkle *2018* - #13 by Mr.Sparkle
As for @CADMAN question 20-40w if more than enough of say either SIL led Bulbs or say your older cobs or whatever, your still gonna need ventilation as heat does build up regardless though can be a pc fan.
As for myself i typically just run them in the same cab till they are getting close then shuffle things around where when pollen is ready to fly those plants are either in a space with seedlings they wont effect or plants i intend to pollinate or at least don’t mind the odd seed being created, though i do turn off my circulations fans if they are running with plants that can be pollinated.