wietefras
Well-Known Member
Well from the research papers/results I saw, they seem to go for an FR dose of 3000µmol to 4000µmol per m2.
Many strains can go fine for less than 12 hours of dark even without additional FR light, but others will really need at least 12 hours of dark. So depending on the strain, less would work too, but then it's difficult if not impossible to be sure what the actual needed dose for each strain is.
So, I'd rather be safe than sorry and go for that range of 3000µmol to 4000µmol per m2
A single Osram OSLON SSL 730Nm @ 350mA will produce about 1.4µmol/s of FR light. So that would need to run for 3000µmol / 1.4µmol/s = 2142s (or 36 minutes) to produce at least 3000µmol. I have 4 of those per square meter, so I keep them on for 10 minutes.
Perhaps 15 minutes would be even better to hit the high end of the range and to account for wall losses.
Many strains can go fine for less than 12 hours of dark even without additional FR light, but others will really need at least 12 hours of dark. So depending on the strain, less would work too, but then it's difficult if not impossible to be sure what the actual needed dose for each strain is.
So, I'd rather be safe than sorry and go for that range of 3000µmol to 4000µmol per m2
A single Osram OSLON SSL 730Nm @ 350mA will produce about 1.4µmol/s of FR light. So that would need to run for 3000µmol / 1.4µmol/s = 2142s (or 36 minutes) to produce at least 3000µmol. I have 4 of those per square meter, so I keep them on for 10 minutes.
Perhaps 15 minutes would be even better to hit the high end of the range and to account for wall losses.