Articles
Optimization of spatial lighting uniformity using non-planar arrays and photosynthetic photon flux density modulation
Article number
1337_14
Pages
101 – 106
Language
English
Abstract
Planar, regularly spaced arrays of horticultural luminaires exhibit poor spatial uniformity due to a bullseye effect where photosynthetic photon flux density (PPFD) is higher at the canopy interior regions, and lower at the edges and corners.
This can lead to uneven plant growth especially in sole-source lighting environments.
Two different methods are presented to improve spatial uniformity: non-planar placement of luminaires, and PPFD modulation of individual luminaires in a planar regular array.
A non-planar design is computed by an algorithm that models millions of possible layouts and selects the best design according to a statistical measure of uniformity.
The algorithm was used to optimize both an HPS-lamp layout and an LED layout in a research greenhouse, with performance verified with PPFD mapping at canopy level.
This can lead to uneven plant growth especially in sole-source lighting environments.
Two different methods are presented to improve spatial uniformity: non-planar placement of luminaires, and PPFD modulation of individual luminaires in a planar regular array.
A non-planar design is computed by an algorithm that models millions of possible layouts and selects the best design according to a statistical measure of uniformity.
The algorithm was used to optimize both an HPS-lamp layout and an LED layout in a research greenhouse, with performance verified with PPFD mapping at canopy level.
Authors
K. Harbick, N.S. Mattson
Keywords
lighting uniformity, photometrics, PPFD modulation
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