A horticulture - illuminating device, which is arranged, at least one spectral peaks (401, 402, 403) to emit at a wavelength with an increased reflectivity of flowers pollinating plants (710, 711), characterized in that, and the lighting unit is arranged, at least one spectral peaks (401, 402, 403) at a wavelength to emit the formulation with increased photo position sensitivity of vision of insects (840) coincides.