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Light: Difference between revisions
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<ref>https://www.licor.com/documents/c8jrv1uxa6yasnrgy2esxksh0rkfhdik</ref>
<ref>https://www.mmjdaily.com/article/9112322/setting-light-levels-for-cannabis-growth/</ref>
== Measuring light intensity ==
The amount of photosynthetically reactive light ([[Light#PAR|PAR]]) can be measured using a PAR meter or a lux meter combined with the chart of the light's spectral power distribution (SPD).
A dedicated device may provide the most accurate results, but a cheaper alternative is to use a PPFD meter app on a smartphone. These apps use the phone's brightness sensor to find a lux value and ask the user to input the spectrum of the light they are using.
An example can be found at [https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator waveformlighting]
== Light spectrum ==
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