Articles
ELECTRIC ENERGY CONSUMPTION AND PPFi OUTPUT OF NINE 400 WATT HIGH PRESSURE SODIUM LUMINAIRES AND A GREENHOUSE APPLICATION OF THE RESULTS
Article number
418_26
Pages
195 – 202
Language
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.
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.
Authors
A.J. Both, L.D. Albright, R.W. Langhans, B.G. Vinzant, P.N. Walker
Keywords
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