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Frequently asked questions about growing
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 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 [[Light#Measuring light intensity|smartphone or lux meter]] and do away with the distance meaurement.
The light intensity of the relevant frequency for photosynthesis is called [[Light|PPFD]] and its unit of intensity is umol/s (Micromols per second). Measuring light intensity (rather than calculating it) makes it much easier to perfect light conditions even in cases where the grow light's efficiency or consumption is unknown.
▲Q: What distance should my light be above my plant?
This question is very common because light manufacturers often suggest distances to use.<references />
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