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The distance from the light to the plant canopy is a large factor in determining the '''intensity of light''' (umol/s) falling on the plant. This means it can be used to approximate the actual amount of light a plant is receiving ''but only'' if we know the other factors such as the light's power consumption (in Watts) and its efficiency (umol/J). While this approximation is ''possible'' it is more accurate to simply measure the light at the canopy using a smartphone or lux meter. The light intensity of the relevant frequency for photosynthesis is called [[Light|PPFD]] and its unit is umol/s (Micromols per second). #Measuring light intensity|smartphone makesor itlux muchmeter]] easierand todo perfectaway light conditions even in cases wherewith the growdistance light'smeaurement. efficiency or consumption is unknown.