How to convert Lux to PPF / PPFD?

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superhaze420

New member

• Mar 5, 2020

• #1

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?

 

I'mback

Comfortably numb!

• Mar 5, 2020

• #2

Lumens multiplied by 0.0185 = PPFD

 

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superhaze420

New member

• Mar 7, 2020

• #3

I'mback said:

Lumens multiplied by 0.0185 = PPFD

Click to expand...

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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Phagoos

Member

• Mar 7, 2020

• #4

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/conversion-ppfd-to-lux/
https://horticulturelightinggroup.com/blogs/calculators/converting-lux-to-ppfd

 

f-e

Well-known member

Mentor

Veteran

• Mar 22, 2020

• #5

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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CrushnYuba

Well-known member

• Apr 11, 2020

• #6

Why are all these LED posts on the greenhouse section?