Abstract
The broad-band characteristics of microwave-powered E lamps (Fusion Systems Corp.) were determined in an EGC growth chamber with a water-cooled light cap and a plexiglass barrier. Radiation measurements were made from 0.29 to 3) μm with an Eppley PSP pyranometer and from 3 to 50 μm with an Eppley PIR pyrgeometer. Photosynthetic photon flux (PPF) was measured with a LI-COR quantum sensor. At full power, the lamps provided over 1700 μmol m-2 s-1 of PPF, 47.8 kW m-2 from 0.29 to 3 μm, and 678 W m-2 from 3 to 50 μm, and at half power, 650 μmol m-2 s-1 of PPF, 17.1 kW m-2 from 0.29 to 3 μm, and 404 W m-2 from 3 to 50 μm at a distance of 1.2 m. Spectral measurements were made every 2 nm from 250 to 792 nm with an Optronics Lab Model 752 spectroradiometer under a single bare lamp. Based on total irradiance between 250 and 792 nm, the distribution of irradiance from 250-280, 280-320, 320-400, 400-700, and 700-792 nm was 0, 0, 1.5, 88.1, and 10.5% for the E lamp and 0, 0.6, 7.8, 73.6, and 18.2% for a mid-day June sun at Beltsville, MD respectively. The phytochrome photoequilibrium for E lamps was calculated at 0.76 as compared to 0.72 for sunlight.
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