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The spectral properties of 3.4kW microwave-powered sulfur (MPS) lamps were compared with sunlight and with a combination of high-pressure sodium (HPS) and metal halide (MH) lamps. Photosynthetic photo...n flux (PPF) levels at 1.2m from the MPS lamps (half and full power) and the HPS/MH lamps were 565, 1650, and 875μmol m^<-2>s^<-1>, respectively, versus 2000μmol m^<-2>s^<-1> for sunlight. The percent of spectral irradiance from bare MPS lamps operated at full power was comparable to that of sunlight in the 400-500nm (blue) and 600-700nm (red) regions but was 60% higher in the 500-600nm (yellow) region. On a percent distribution basis, HPS/MH lamps had 50% less blue, nearly 25% more red, and twice as much yellow irradiance as sunlight. On a percent basis, MPS and HPS/MH lamps emitted one third to one half as much 700-792nm (far-red) irradiance as sunlight. At half power, there was a significant shift in spectral output of the MPS lamps from the red to the blue region. Measurements taken with a pyranometer and a pyrgeometer indicate that the biggest difference between MPS and HPS/MH lamps was in the 0.8 to 3.0μm (near infrared, NIR) region; MPS lamps emitted one quarter as much NIR as HPS/MH lamps or the sun on a normalized basis (Jμmol^<-1>). There was no appreciable difference in far IR (3 to 50μm) between half power MPS and HPS/MH lamps, while at full power, MPS lamps had only one half as much far IR. Based on their spectral characteristics and high PPF, MPS lamps should provide an excellent source of radiant energy for use in plant growth chambers.続きを見る
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Mendeley出力
KJ00004506897