The selection of the most cost effective lighting fixture interacts with many factors, including cost of electricity, cost of fixture, cost of cooling, hours of operation per year, and especially, the fraction of PPF absorbed by the plant canopy. This article is based on the MSRP for fixtures at the time of publication. Quantity discounts may be available for some fixtures. We developed an on-line calculator to facilitate a more detailed analysis of options: http://cpl.usu.edu/htm/pu...
Jake Nelson and Bruce Bugbee