Manual Growing lights
conditions, it takes up to 60-90 minutes for the last foraging bumblebee to return to the
hive. Under low light conditions, this time increases up to 120 minutes [...] you are likely lose a lot of bumblebees because they get locked up
above the screen. Lock up the bees 90-120 minutes before the energy screens close.
2.3 [...] until week 9, it is also important to make sure that the bumblebee hives catch direct daylight
(no filters, screens, etc.). If you do have screens in your