A/D; Car; Chl; ETR; Electron transport; Excitation partitioning; FRL; GL; LED; LHCI, LHCII; Leaves; P700; PAD, PFD; PC; PQ(H(2)); PSI, PSII; Photosystems; Quantum yield; STF; WOC; Y(II), Y(I); analog-to-digital converter; carotenoids; chlorophyll; donor pigment of PSI; electron transport rate; far-red light; global quantum yield of the photosystem with respect to all quanta absorbed by the leaf; green light (540nm); intrinsic quantum yield of the photosystem with respect to quanta absorbed by the particular photosystem; light-emitting diode; light-harvesting complexes of PSI and PSII; photon flux density, absorbed and incident; photosystems I and II; plastocyanin; plastoquinone (reduced); single turnover flash; water-oxidizing complex; y(II), y(I)