How much light is too much light outdoors, in terms of night cycle?

HandyGringo

Well-Known Member
I just want to be prepared for Autumn, so I was wondering if these decorative lights, for instance, is enough to upset the night cycle?

None of them are near the cannabis plant, but they're within a few feet/meters of the plant.
 

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Tracker

Well-Known Member
I agree with @warble

I have a porch light about 40ft from my outdoor patch and bedroom window about 10ft. A desk lamp is just inside the window. I try to keep the lights off at night as much as possible, but sometimes they get turned on or are left on all night. They are not very bright lights. The porch light is equivalent to 100w incandescent and the desk lamp is like 40w incandescent. It has not caused problems with the plants.
 

Tracker

Well-Known Member
Check out this YT video
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Thank you for posting this. It's been a long while since I checked out Bugbee videos. He must have put out a lot of new things since then. I'll have to catch up on his latest things. This ine was a useful study for sure.
 

Delps8

Well-Known Member
Thank you for posting this. It's been a long while since I checked out Bugbee videos. He must have put out a lot of new things since then. I'll have to catch up on his latest things. This ine was a useful study for sure.
Heh, you're very welcome.

I'm a new grower (3 ½ years) and I drank the Bugbee Koolaid soon after I started growing. A lot of the things that he talked about in 2021 and 2022 have been very much fleshed out in the past 6-12 months.

First issue - Bugbee talks about photosynthesis rates in his videos of a few years ago and what he was saying was backed up by the Chandra paper (attached). The gist of that research was the photosynthesis curve starts to roll off by around 1kµmol, even in enhanced CO2. That fit well with the conventional wisdom of the light saturation point for cannabis being 800-1kµmol.


Chandra - Cannabis photosynthesis vs PPFD and Temp.png

That sorta made sense to me but I had this nagging thought "I'm not harvesting (net) photosynthesis." and, as it turns out, the entire idea of net P being a proxy for yield was blown out of the water by the authors of the Frontiers paper (attached).

In the Frontiers paper, the authors use the term "plasticity" to describe the fact that yield keeps going up well past the 1kµmol mark were P starts to roll off. When I read that, that's when I started growing at 70-80 DLI for autos and for photos in veg.

That was just one study though and Bugbee didn't change his tune much until late last year when he opened the kimono a bit and started talking about temperature being really important.

What was happening behind the scenes is that Mitch Westmoreland, a PhD student studying under Bugbee at Utah State, was doing his research and, from my perspective, what Westmoreland has done has blown things completely open. Westmoreland is a different cat than Bugbee; he's much younger, obviously, but he was able to do his research when FedGov made it much easier to do research on cannabis. That's not to take anything away from Westmoreland - he's seen a need and filled it.

The "big reveal" is in Westmoreland's videos for the Future Cannabis Project and also this video
Those videos put to rest a lot of the conventional wisdom and a lot of misinformation that's published as being valid ("misinformation" can be applied pejoratively but it is appropriate for some of the drecht that some sites publish - Photone's "recommendations" come to mind).

Bugbee himself did an interview with Shane @ Migro with some of the new info and he's always good to watch but, by and large, it's been the Westmoreland show for the past six to eight months and the guy really delivers.
 

Attachments

Tracker

Well-Known Member
Heh, you're very welcome.

I'm a new grower (3 ½ years) and I drank the Bugbee Koolaid soon after I started growing. A lot of the things that he talked about in 2021 and 2022 have been very much fleshed out in the past 6-12 months.

First issue - Bugbee talks about photosynthesis rates in his videos of a few years ago and what he was saying was backed up by the Chandra paper (attached). The gist of that research was the photosynthesis curve starts to roll off by around 1kµmol, even in enhanced CO2. That fit well with the conventional wisdom of the light saturation point for cannabis being 800-1kµmol.


View attachment 5390579

That sorta made sense to me but I had this nagging thought "I'm not harvesting (net) photosynthesis." and, as it turns out, the entire idea of net P being a proxy for yield was blown out of the water by the authors of the Frontiers paper (attached).

In the Frontiers paper, the authors use the term "plasticity" to describe the fact that yield keeps going up well past the 1kµmol mark were P starts to roll off. When I read that, that's when I started growing at 70-80 DLI for autos and for photos in veg.

That was just one study though and Bugbee didn't change his tune much until late last year when he opened the kimono a bit and started talking about temperature being really important.

What was happening behind the scenes is that Mitch Westmoreland, a PhD student studying under Bugbee at Utah State, was doing his research and, from my perspective, what Westmoreland has done has blown things completely open. Westmoreland is a different cat than Bugbee; he's much younger, obviously, but he was able to do his research when FedGov made it much easier to do research on cannabis. That's not to take anything away from Westmoreland - he's seen a need and filled it.

The "big reveal" is in Westmoreland's videos for the Future Cannabis Project and also this video
Those videos put to rest a lot of the conventional wisdom and a lot of misinformation that's published as being valid ("misinformation" can be applied pejoratively but it is appropriate for some of the drecht that some sites publish - Photone's "recommendations" come to mind).

Bugbee himself did an interview with Shane @ Migro with some of the new info and he's always good to watch but, by and large, it's been the Westmoreland show for the past six to eight months and the guy really delivers.
Thank you for an explanation of all that. I will check out some Westmoreland stuff.
 
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