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Article
Efficacy of Two HORTILED Fixtures
Crop Physiology Laboratory
  • Jakob Johnson, Utah State University
  • Paul Kusuma, Utah State University
  • Bruce Bugbee, Utah State University
Document Type
Report
Publisher
Utah State University
Publication Date
12-1-2017
Abstract

We tested the efficacy of the Full Spectrum and Red-Blue HORTILED TOP LED fixtures manufactured by PL Light. Both fixtures had an 80° light distribution.

The efficacy of the fixtures was measured using flat plane integration as described by Nelson and Bugbee (2014)1 (see adjacent photo). The fixtures were suspended at 0.65 m above the floor in a 3 × 3 m room with flat black walls. The photosynthetic photon flux density (PPFD, μmol · m-2 · s-1) was measured with a recently calibrated quantum sensor (LI-COR model 190R). Measurements were made 2.5 cm apart near the center, increasing to 10 cm near the edge, and extrapolated to infinity using an exponential decay function.

Citation Information
Jakob Johnson, Paul Kusuma and Bruce Bugbee. "Efficacy of Two HORTILED Fixtures" Crop Physiology Laboratory (2017) p. 1 - 1
Available at: http://works.bepress.com/bruce_bugbee/113/