After reading into DLI (thanks @Nicky) , I made this PPFD requirement table, does my math add up?
| Week | Stage | DLI [mol/m^2/d] | Light Hrs | PPFD [ µmol/m^2/s] |
|---|---|---|---|---|
| 1 | Seedling | 12 | 18 | 185 |
| 3 | Early Veg | 15 | 18 | 231 |
| 5 | Veg | 35 | 19 | 512 |
| 7 | Late Veg | 46 | 19 | 673 |
| 9 | Early Bloom | 30 | 12 | 694 |
| 11 | Early Flower | 35 | 12 | 810 |
| 13 | Flower | 38 | 12 | 880 |
| 15 | Late Flower | 30 | 12 | 694 |
Example: At week 6 I should be at ~575 PPFD, according to my lights PPFD chart I’m currently at 737. So likely a little too much light. I’ll pull the lights up another couple inches.
Since PPFD vs. distance can be roughly extrapolated (ref). For my lights:
Big blue dots are manufacturers claims.
I’ll keep my lights at 100% and follow this chart over the grow, adjusting distance to meet PPFD requirements.
I figure with correct water, soil and temperature these PPDF numbers could be ~20% higher.
Assuming this looks roughly correct and is vetted, hopefully this can be used along with light PPFD charts for newbies (like me!).
