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For decades now growers have been obsessed with the
lumen output of their lamps, misguidedly thinking that
the more lumens then the better the light is for the plant.
Lumens is how we started to measure light back in the
day and is a measurement by its availability to the human
eye curve and is the industry standard way of measuring
any lamp.
Plants do not even recognize what a lumen is , but
instead rely on photons hitting the surface of the leaf to
make them grow, these photons we call
PAR(photosynthetic active radiation). PAR is measured in
micromoles(
mol m-2 s-1) and is basically a count of the
photons hitting a surface that are available for use by the
plant.
5
PAR VALUE (µmol m-2 s-1)