smokey0418
Well-Known Member
Dipped a bit into co2 years ago , but growing just for myself primarily gifting flower to friends.
My consumption can’t keep up . Lol.
Great job.
Led yields..
- Thread starter Billytheluther
- Start date
My consumption can’t keep up . Lol.
Great job.
If you're getting 6 ounces out of a 2' x 4' there's something awry with your environment. I grow from seeds and find that the yield estimates from vendors (450 to 650 gm/sq mete) are accurate and, generally, conservative.
But when it comes to HPS vs LED, the attached paper sheds some light on the issue.
The research was carried out under controlled conditions. Check the paper to see how things turned out.
At issue is that yield decreases as the percentage of blue photons increases. It's not a function of an HPS light as an HPS light, rather it's because HPS was 4% blue vs a standard "white" LED that, though it varies from manufacturer and even one model of light to the next, has more blue. In some cases, a lot more blue.
Lights for small grow spaces (the XS-1500 Pro) for example, will tend to have more blue because the manufacturer doesn't want the plants to grow through the top of the, assumedly, shorter tent. I'm not privy to anyone's light design. No, it's my suspicion based on looking at lights from different vendors and trying to understand why they design their products the way they do.
On the other hand some HLG lights, which are marketed as being an HPS replacement, have low percentage of blue as well as 730nm diodes to compliment the 660nm diodes.
I think the results of the paper are that HPS generates more cannabis but at a "signficantly" higher cost. What's "significant"? To a personal grower, X% more electricity for the same yield is OK because X percent of "not much" is still "not much" but to a commercial grower who has to pay for extra HVAC as well as more $$ for electricity, it's a different story.
But when it comes to HPS vs LED, the attached paper sheds some light on the issue.
The research was carried out under controlled conditions. Check the paper to see how things turned out.
At issue is that yield decreases as the percentage of blue photons increases. It's not a function of an HPS light as an HPS light, rather it's because HPS was 4% blue vs a standard "white" LED that, though it varies from manufacturer and even one model of light to the next, has more blue. In some cases, a lot more blue.
Lights for small grow spaces (the XS-1500 Pro) for example, will tend to have more blue because the manufacturer doesn't want the plants to grow through the top of the, assumedly, shorter tent. I'm not privy to anyone's light design. No, it's my suspicion based on looking at lights from different vendors and trying to understand why they design their products the way they do.
On the other hand some HLG lights, which are marketed as being an HPS replacement, have low percentage of blue as well as 730nm diodes to compliment the 660nm diodes.
I think the results of the paper are that HPS generates more cannabis but at a "signficantly" higher cost. What's "significant"? To a personal grower, X% more electricity for the same yield is OK because X percent of "not much" is still "not much" but to a commercial grower who has to pay for extra HVAC as well as more $$ for electricity, it's a different story.
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