Manual Growing lights

Several placement systems can be used for this. It is also important to give the bumblebees the opportunity to work during the hours with the most daylight. [...] walkway under the gutter (according to Koppert’s general placement advice). From week 40 until week 9, it is also important to make sure that the bumblebee hives [...] 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.