Future growing, grow systems, horticulture, Lighting, Liverpool Hydroponics, Lumens, Lux, PAR -

Demystifying Lumens, Lux and PAR LED lights require new thinking about the way we measure light for use by plants. The typical rating most growers are familiar with is the “lumen.” The definition of the lumen is the total light produced within the range of the human visual response. It tells us nothing about the distribution of that light energy over the spectrum, and most importantly, it doesn’t tell us how much is useful for plants. The problem with lumens is especially pronounced when measuring light at the far ends of the human visual response curve. Consider three lamps—red, green...

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