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The efficiency of fluorescent lamps in young lettuce plant production


, : The efficiency of fluorescent lamps in young lettuce plant production. Norwegian Journal of Agricultural Sciences 5(3): 261-268

The relative efficiency of six different kinds of fluorescent lamps for growth and development of young Lactuca sativa L. plants was examined. The experiments were carried out in a greehouse under winter light conditions (latitude 60.degree. N), and in growing rooms without natural daylight. The irradiance level of all lamps in the experiments was 15 W m-2 (in the wavelength range 400-1000 nm) and plants were irradiated for 18 h day-1 over a period of three weeks. In greenhouses, as in growing rooms, growth in terms of fresh and dry weight as well as leaf number and chlorophyll content were higher for plants grown in light from Osram L/Fluora than those grown in light from the other lamps. Used only as a greenhouse supplemental light source, there were no differences in plant growth or development between Philips TLD/33 and Philips TLD/84. In growing rooms, however, Philips TLD/33 was more effective than the latter. As judged by fresh and dry weight Atlas Warm White was less effective than the former light sources in all cases, while Philips TLD/83 was the least effective light source in both greenhouse and growing rooms. Measurement of the spectral energy distribution as well as the recorded growth responses showed that the effects of Philips TLD/84 and Osram L/Lumilux were identical.

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