Fig. 2

Light intensity distribution in FluorCam systems. Measured light intensities in relation to the distance of the FluorCam panel (white emitting diodes) or of the light panels installed in the adaptation tunnel, respectively. Different light intensities (given in %) were tested, while the distance of the micro-quantum sensor was varied. a System for small plants. b System for large plants. c–e Spatial distribution of PAR intensities across the carrier top area. c LED panel derived light intensity in adaptation tunnels (at maximum setting, measured at carrier level). d FluorCam panel derived actinic light intensities (at maximum setting, measured at working distance). e Intensity of FluorCam panel derived saturating pulse (at maximum setting, measured at working distance). All shown values of PAR are given in µmol m⁻² s⁻¹