Manual Growing lights
outside.
To help them do their job, our general advice is to place the hives as high as possible (above the crop) in
the greenhouse. Several placement systems [...] 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 [...] is controlled by a timer
or the climate computer. On a rare occasion, when air pressure drops, the system is opened automatically
to prevent the bumblebees