Thanks for the info. What about Quantum Boards and Pucks in combination. I've seen some DIY plans for these. Any benefits?
Hi Katsu,
Replacing a 1000w hps with leds will require a bit more than just changing lights, it will need adaptations in growing style a bit. Mostly because of two factors, first is light spread and intensity, the second is less radiant heat coming from the light.
I think cobs on pc coolers are the least expensive option and have the benefit of good light intensity when driven at 100w/cob. The quantum boards will have a better spread but lower intensity so the taller plants won't get enough light in lower parts.
Usually this only means you need a bit more lst or scrogging for good canopy management.
My choice are cobs, bridgelux vero SE driven at almost 100w and the plants like it a lot.
Just another thought, i have a feeling that plants which were bred indoors under hps exclusively might show some lockout deficencies during veg and bloom phases, so feeding will also need some adjustments.
Take care and have a great weekend.
Cheers
it's my assumption which is mostly based on logic but also on some minimal observation during my grows and hearing other peoples experience.
I took some time to analyze different light sources spectrums which are used with cannabis and to me the phenomenon seems obvious but honestly I'm unable to explain it in scientific terms without doing proper science first.
My little experience was always similar, the plants I did grow under leds(I only use cob leds, for the record) and I knew their seeds came from breeders who use exclusively hps lights for seed runs, there were always some deficencies showing in veg and mid flowering. Of course there are other factors involved but since I keep my feeding consistent for most plants, the hps bred showed small but obvious differences in nutrient uptake. Nothing drastic or unmanageable but enough to scare newbs and cause worry in not experienced growers.