Manual Growing lights
Switching on the growing lights before midnight, causes the flowers to close as early as 10:00 in the
morning, which leaves hardly any time for the bumblebees [...] Under certain 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 [...] after 10:00
in the morning, depending on the system you use to control the opening or closing of the hives. The
bumblebee hives should be closed 2 hours