Manual Growing lights

In winter time, when (UV)light levels are already low, growing lights (SON-T) are often used. These lights spread a lot of light in the yellow/red light [...] bees’ vision (see figure 1.2). Source: Philips Figure 1.2 light spectrum of SON-T lamp. On further examination, we also found that flowers use UV patterns [...] shows that a lot of bumblebees can get lost. Note: A bumblebee colony can lose all its foraging bees in just 2 hours if the placement advice for pollination