Advice for tent growing is to make sure the are no light leaks at all. Any light leaks, even minor ones, will spoil the grow and disturb the plants from flowering (so it is written anyway).
So how do outdoor plants deal with streetlights, moonlight, porch lights, etc? How does any cannabis plant flower outside in a civilized area? Not trying to be a wise guy, just curious.
Thanks.
Oh go ahead and be a wise azz… 
Your question is good outdoor grows can take full moon light and not get messed up. I agree the caution is over stated…
I grow outdoors my living room lights shine on my plants my bathroom light shines on my plants. I try to limit exposure time and intensity as much as possible. I found a couple seeds on one of my plants but no signs of a Hermie. If theres a light on all the time thats close enough and bright enough I guess it could cause a plant to hermie. The moon and stars dont really put out enough light to hurt anything. Dim lights through curtains don’t either
I grew outdoors last summer. We have security lighting that triggers on movement as well as the surrounding neighbors. Also street lights. No hermies.
It is that time of Year again…and most plants in the Northern Hemisphere are starting to pre-sex… So this topic is definitely still relevant.
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There is a HUGE difference between using artificial lighting on timers and forcing a plant to flower on OUR timeline, and allowing it to grow outdoors on it’s own timeline.
Does outdoor lighting/light pollution affect them?
It can, if it is HID lighting, intense lighting, or lights close to them.
It can slow the beginning of flower.
But Stress hermies? Doubtful.
The intensity of sunlight makes their reaction to small amounts of artificial light negligible.
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We stress the plants indoors by using artificial light to change their normal cycle and bloom when WE want…either speeding up or delaying the chemical process they go through to be sexually mature.
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Outdoors, there is bright moonlight during full moons etc… and it is NORMAL- the plants existed for millions of years outdoors dealing with it without our intervention…still does.
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Hermies outside are usually from genetics, pH stress, lack of proper nutes /water,severe bug or root damage, etc… they have to be REALLY stressed- unless it is genetic.
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Indoors-- some strains will never hermie-- they have strong genetics and do not stress easily…where some strains will hermie if you look at them wrong.
Anything listed online as '‘for experienced growers’ means they are touchy… and will react to light leaks.
Tada ya there, in a nut shell as more to to do direct then ambiant in my brain!
Outdoor lighting being left on all night mid flower, if its bright enough and close enough, can cause the plant to start to reveg. If it happens a bunch of different times during flower and the plant keeps going back and forth, reveg, flower, reveg, flower, that can definitely stress out the plant. Still IMO genetics plays a big roll in plants going hermie. Weak genetics might not be able to handle that. But how do you know if the plant would or wouldn’t have hermied anyway.
Light pollution and the amount needed to make our girls think it is daytime is measured in umols. I am going to link Bugbee’s vid on this. 10 umols is the threshold for plants thinking it is time to photosynthesize. The brightest full moon on a completely clear night is only putting out 2 umols. 100% dark although optimal, is not needed. As long as you are below the 10 umols and if you cannot read print, it is dark enough. Small lights from power strips, humidifiers etc is not a concern.
Personally, I just experienced this exact thing.
I had 6 plants growing outside… Two of the 6 were clones from a known female. When we started getting more and more rain I started putting the plants on my back porch when expected to rain and then moved them back into the yard when it was clear. I never really thought about ambient lighting.
My back porch has a glass door, a window, French doors and a kitchen door with a window. We’re typically awake till 11pm so there’s ambient light shining out there. A kitchen light stays in all night. Well, a couple weeks back the plants started to flower and noticed one looked wonky. As it turns out one turned hermie, the known female. Maybe it was other factors, maybe not. Some said the plant was a male, rest assured it was from a know female (clone). It’s a Nori Cake strain.
I’m new to this, my 2nd grow so I’m no pro. The lighting is the only thing that I can think was the issue. I moved the plants away from the house since then.
Very interesting 
The plant pictured was not a hermie. Hermies have both pistils and balls. That is full blown male Grobro.
