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Old 03-05-2020, 03:02 PM #1
superhaze420
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How to convert Lux to PPF / PPFD?

Hi all,

I have a Quantum Board led and a lumen meter. I would like to know how I can convert the lumens to PPF so I can adjust the light output.

There are many calculators online but are they real? are they effective?
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Old 03-05-2020, 04:21 PM #2
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Lumens multiplied by 0.0185 = PPFD
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Old 03-07-2020, 11:11 AM #3
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Quote:
Originally Posted by I'mback View Post
Lumens multiplied by 0.0185 = PPFD
May I ask where you got that number? I'm curious, so I can check against other sources. I found this lux to ppfd converter online with tables, but I don't know if it's right either: https://mimarihuana.es/ppfd-para-cultivar-marihuana/

It is interesting that depending on the tone of light (K) the conversion is different.
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Old 03-07-2020, 11:31 AM #4
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0.0185 seems to be the conversion factor for sunlight.
For (white) leds (or any artificial lighting) you get a different factor depending on CRI and color temperature.

https://www.apogeeinstruments.com/co...n-ppfd-to-lux/
https://horticulturelightinggroup.co...ng-lux-to-ppfd
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Old 03-22-2020, 04:54 PM #5
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I put this together for myself. It might interest you though



Edit: Twice I have wrote out lots, only to click advanced to add pics, and lost my post. The gist of which, is use the bar chart info as a starting point. Not fact.
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Old 04-11-2020, 07:07 AM #6
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Why are all these LED posts on the greenhouse section?
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