Rahz
Well-Known Member
Good info, and not surprising especially with PPFD being measured at the ideal height and more plant matter being located below that plane than above it. I'll take a look at PWM, a quick search does indicate increased efficacy.@Rahz I have done a run to try and find the maximum PPFD a strain could handle and was smashing it with up to 3500 PPFD while keeping the ambient temps between 25-30c. As long as the temps were kept in check, the plant can handle it. More relevant is DLI - the plants can handle the high intensity for shorter periods but once they hit their max DLI, damage starts to occur.
Apparently lettuce can handle up to 5000 PPFD in recent research but didn't increase yields.
There is a benefit though, you can use the higher intensity light to reduce your lights on time and increase flower period, which with FR speeds up the flower cycle. Still working on the particulars but I have reduced my lights on down to 6hrs using a 1500-1850 PPFD at the canopy.
Also since you seem fairly smart and a decent vendor, you should go take a look at using PWM current to drive the cobs. Not the PWM dimmer option on meanwells, they still provide stabilized current to the cobs. Do your research into it and see if you are able to source a LED driver with PWM output.
Wait, so you're running 6 hrs. on or 6 hrs. at max intensity?
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