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 [...] be better not to
release the bumblebees on the specific day, but to open the hive the following day. Never keep a
hive closed for longer than one day unless [...] equipped with a blue hive door (in the visible spectrum for bumblebees) and
has a special, flower shaped, UV pattern around the entrance of the hive to help the