Manual Growing lights
not cause any drift of bumblebees.
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Figure 2.3 Drift in bumblebee hives caused by stacking hives.
2.3 Other influencing factors
2.3.1 Coatings, screens [...] Other horizontal placement systems
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2.2.4 Vertical placement systems
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2.3 Other influencing factors
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2.3.1 Coatings, screens & filters
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2.3.2 [...] also showed that bumblebees tend to drift if hives are stacked (see figure 2.3). They prefer flying to the
lowest hives, which causes the hives at the top