Freedom_Fighter
2025 Circle of Excellence
This is a part of the answer I got from the Sanlight Support Team:
The optimal distance between the light and the plant is 30 cm. This allows you to achieve an average PPFD of 880 µmol/s/m².
This PPFD value scales linearly with the dimming level. That means:
- At 100% you have 880 µmol/s/m²
- 80% = 80% of 880, so 704 µmol/s/m²
- 60% = 60% of 880, so 528 µmol/s/m²
- and so on.
This distance applies to every growth stage of your plants, because it provides the most homogeneous light distribution. The light intensity is then controlled via the dimmer.
Regarding the dimmer settings:
Unfortunately, we do not have exact 1:1 guidelines for these settings, because every grow is individual and different genetics have different needs. There are many opinions on how these settings should be adjusted, so it is best to rely on the breeder’s recommendations.
In general, the guidelines are approximately:
- 100–300 µmol/s/m² (PPFD) for seedlings
- 250–600 µmol/s/m² in the vegetative phase
- 600–1100 µmol/s/m² in the generative (flowering) phase
I like that. Their guidelines look good. Impressive, indeed. Cheers!!











