Manual Growing lights
growing 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 [...] 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. [...] conditions it may 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