I would like to design my own grow lights to grow indoor plants like strawberries, herbs, etc. But I have a problem that I need some help to work out:
- How many LEDs do I need to light up an area of 0.25m²?
- At a hanging height of 0.15m?
- To get a PPFD of 750μmol/s/m²?
I want to work out how many LEDs I would need using this data I found on a particular single horticulture LED:
Link:https://au.mouser.com/ProductDetail/Cree-LED/XPGDPR-L1-0000-00G01?qs=UkDUCjYnTB0Zr%252B2VeuKxwg%3D%3D
From reading this forum and doing a bit of research, I found out that you can use this formula to find the PPF of an LED: PPF = gradient flux/energy of a photon
- energy of a photon = E = hc/λ
And then I can use the PPF to find the PPFD by dividing it by the area.
Units of measurement:
- PPF - μmol/s
- PPFD - μmol/s/m²
Let me know if this is correct or any other formulas I can use to work this problem out. And I wouldn't mind seeing any example calculations since I think I'm getting the wrong values, and I don't know how to implement height into the formula for PPFD.
TLDR: I need help to design some grow lights but how many LEDs do I need to get a PPFD of 750 μmol/s/m², on an area of 0.25m² at a height of 0.15m?