Manual Growing lights
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. [...] can be used for this. It is also important to give the
bumblebees the opportunity to work during the hours with the most daylight. Therefore, we advise using [...] lights come on and start to close 10 to 12 hours later.
Switching on the growing lights before midnight, causes the flowers to close as early as 10:00 in