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Light: Difference between revisions
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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.
For example [https://play.google.com/store/apps/details?id=com.homestudio.ppfdmeter PPFD Meter] on Android or [https://apps.apple.com/us/app/photone-grow-light-meter/id1450079523 Photone] on iPhone (Better implementations may exist).
An example can be found at [https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator waveformlighting]▼
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== Light spectrum ==
The color of light is dependent on the frequency of the light. see also [https://en.wikipedia.org/wiki/Electromagnetic_spectrum Electromagnetic spectrum]. Blue/purple light used to be standard in Cannabis growing but
=== High frequency light ===
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