ISHS Acta Horticulturae 418: III International Symposium on Artificial Lighting in Horticulture
ELECTRIC ENERGY CONSUMPTION AND PPFi OUTPUT OF NINE 400 WATT HIGH PRESSURE SODIUM LUMINAIRES AND A GREENHOUSE APPLICATION OF THE RESULTS |
| Authors: | A.J. Both, L.D. Albright, R.W. Langhans, B.G. Vinzant, P.N. Walker |
| Abstract:
The PPFi (instantaneous photosynthetic photon flux, in μmol m-2s-1) output and electric energy consumption of nine different 400 watt high pressure sodium (HPS) luminaires were measured at six mounting heights from 0.5 to 3.0 m in 0.5 m increments. Differences in luminaire efficacy and PPFi distribution patterns were found, but too few luminaires were tested to reach statistically valid conclusions. The most efficient luminaire proved 25% more energy efficient than the least efficient luminaire. PPFi data from one of the luminaires tested was used to design a research greenhouse which required uniform PPFi distribution patterns at various PPFi levels. | |
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