Greenpoint seeds!!

Don't want to get into a "COB vs HPS" debate, but this is where the LED's benefit by lowering canopy temps. The heat produced by LED's is above the heatsink and not below the actual light. The more fans the better, keeps uniform humidity in the area you need it the most. (between canopy and light)
Also, Everyone worries about PM to come from high humidity. Not totally true. PM comes from shade and stagnant air. Fans, fans, fans. Move that air, especially on seedlings. Within 30mins, they will be stronger and no falling over.
I run HPS & MH together (mixed spectrum).
LED isn't a good option for me because I actually need the heat generated by my legacy gear.
If I ran COBs, I'd need to add a heater and they pull serious amps.
 
Don't want to get into a "COB vs HPS" debate, but this is where the LED's benefit by lowering canopy temps. The heat produced by LED's is above the heatsink and not below the actual light. The more fans the better, keeps uniform humidity in the area you need it the most. (between canopy and light)
I think the plant just can't pull enough moisture up the plant to actually "perspire" when the temps are too high.
Also, Everyone worries about PM to come from high humidity. Not totally true. PM comes from shade and stagnant air. Fans, fans, fans. Move that air, especially on seedlings. Within 30mins, they will be stronger and no falling over.
Hate to tell you this, but actually LEDs need higher run temps because they don't have IR in their spectrum. Otherwise you won't get the same perspiration rates and growth will be considerably slower.
 
Hate to tell you this, but actually LEDs need higher run temps because they don't have IR in their spectrum. Otherwise you won't get the same perspiration rates and growth will be considerably slower.
You have to raise humidity if you raise temps, that was my point. They go hand in hand. If not, plants can't keep up and dehydrate, lowering the amount of moisture in the plant.the Plant goes into conserving its moisture to stay alive.
You can get by with higher temps with LEDs if you adjust humidity along with it.
Spectrum King has the temp and humidity chart.
 
You have to raise humidity if you raise temps, that was my point. They go hand in hand. If not, plants can't keep up and dehydrate, lowering the amount of moisture in the plant.the Plant goes into conserving its moisture to stay alive. .
Or you need to water more often.....

You do realize some of the best grow climates have very low humidity almost year round right...

VPD is just a way to maximize growth, your plant won't die from low humidity unless it's a seedling.

In colorado we have a monsoon season, followed by an extremely dry rest of the year. Great outdoor growing here, very low bud rot problems and strong sun make colorado outdoor fire.

I would rather dry than wet, try to grow outdoors in FL, bud rot city. Look how crap the outdoor is from the PNW...wet and cold..
 
Or you need to water more often.....

You do realize some of the best grow climates have very low humidity almost year round right...

VPD is just a way to maximize growth, your plant won't die from low humidity unless it's a seedling.

In colorado we have a monsoon season, followed by an extremely dry rest of the year. Great outdoor growing here, very low bud rot problems and strong sun make colorado outdoor fire.

I would rather dry than wet, try to grow outdoors in FL, bud rot city. Look how crap the outdoor is from the PNW...wet and cold..
I am talking about at the top of the plant canopy. That air is gonna be a lot dryer than middle ways down the plant. Air flow across the top of the canopy will help equal out the humidity at and above the canopy.
 
Or you need to water more often.....

You do realize some of the best grow climates have very low humidity almost year round right...

VPD is just a way to maximize growth, your plant won't die from low humidity unless it's a seedling.

In colorado we have a monsoon season, followed by an extremely dry rest of the year. Great outdoor growing here, very low bud rot problems and strong sun make colorado outdoor fire.

I would rather dry than wet, try to grow outdoors in FL, bud rot city. Look how crap the outdoor is from the PNW...wet and cold..
I grow outdoors in the PNW and your statement is 100% correct -- unless you can find a strain that finishes around mid Sept.
It's easy to make the mistake of thinking an 8 week strain would work great outdoors -- only to find out that it doesn't start flowering until the second week of August. :-(
 
Swung by the growroom on my way in to work, brought my camera with me instead of cellphone. Its old but still takes ok pic.

Cowboy Cookies
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A few of her sisters still in flower front left and rear right..yeah they are close to 7ft
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I grow outdoors in the PNW and your statement is 100% correct -- unless you can find a strain that finishes around mid Sept.
It's easy to make the mistake of thinking an 8 week strain would work great outdoors -- only to find out that it doesn't start flowering until the second week of August. :-(
Gotta get those strains they grow in BC canada for that environment.
 
I grew four different strains outside this year and all of them were disappointing thanks to the lack of sunlight and cold temps.
Lost at least 6 zips to bud rot -- probably closer to 8.
Next year I'm going to try Vashon Early Bird.
I lost 75% of my crop this year. Rain, rain, rain. Worst year ever for me.
I have a 44 day strain I got 20 years ago. Called T44.
 
I lost 75% of my crop this year. Rain, rain, rain. Worst year ever for me.
I have a 44 day strain I got 20 years ago. Called T44.
That top 44, I ran it back in 2004 for a year or two. I had a kick ass berry tasting pheno. Never grew it outdoors though.

As for outdoor in PNW, I guess it depends on where in the pnw cuz here in the willamette valley in oregon its still all good. Sure it rained here towards end of oct but a little tarp action and its all good. My buddy just pulled his last week but they could have gone longer.
 
That top 44, I ran it back in 2004 for a year or two. I had a kick ass berry tasting pheno. Never grew it outdoors though.

As for outdoor in PNW, I guess it depends on where in the pnw cuz here in the willamette valley in oregon its still all good. Sure it rained here towards end of oct but a little tarp action and its all good. My buddy just pulled his last week but they could have gone longer.
Yeah, it sounds very different than where I am (north of Seattle, near Everett.)
I had my plants under tarp shelters to keep them dry, but we haven't had squat for sunshine since mid September.
Just checked the forecast -- in the next 10 days we've got 2 days of partly cloudy and the rest is rain & thunderstorms.
Same shit all over again...
 
I grew four different strains outside this year and all of them were disappointing thanks to the lack of sunlight and cold temps.
Lost at least 6 zips to bud rot -- probably closer to 8.
Next year I'm going to try Vashon Early Bird.

I grew three vashon early birds this year, here is the pertinent info.

Very leafy, smells like freshly picked carrots, tastes the same. Does not like to be topped, did not want to bush out at all, just caused the side branches to grow tight to the main stem.

Started flowering in early august. Took it down mid September due to bud rot, that I feel was related to the topping issue. Really hurt air flow. Has a real old school vibe on general.

Also, I had one female and a few males that flowered under 18/6, rest of them behaved.
 
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