Different illumination had no effect on photosynthesis pigments content in
cucumber leaves (Fig. 10). It was established that a slightly smaller content of chloro-
phyll b (Fig. 10 a) and carotenoids (Fig. 10 b) were in plants under modules with
supplemental UV LEDs and chlorophyll b – under “SON-T Agro” lamps. The content of
the latter pigment insignificantly increased under supplemental illumination by green
520 nm and orange 622 nm LEDs installed in modules. The content of chlorophyll a and
carotenoids increased under module with supplemental yellow 595 nm LEDs.
Meanwhile different illumination had effect on ratio of chlorophyll a to b and ratio of
chlorophylls to carotenoids. The least chlorophyll a to and b ratio was in leaves of
cucumber transplants under modules with supplemental UV (380 nm), green (520 nm)
and orange (622 nm) LEDs (Fig. 10 c), but supplemental green and orange light
increased chlorophyll and carotenoids ratio (Fig. 10 d).