Manual Growing lights
differently to humans. They need the blue, green and UV spectrum for foraging, but do
not see in the red light spectrum. Conversely, humans do see in the [...] 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. [...] under growing lights is not applied! Under certain conditions it may be better not to
release the bumblebees on the specific day, but to open the hive the following