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Old 06-26-2011, 07:36 AM   #1
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What is the minimum hours of direct sunlight needed for greenhouse growing?

Can one grow buds with only a few hours of direct sunlight in the morning?

It seems that shaded sunlight is still pretty bright compared to a grow light.
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Old 06-26-2011, 01:50 PM   #2
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People say at least 5 hours direct.

My light meter reads about as high in the shade outside as it does under a 1000w light bulb... ?

since greenhouses are usually translucent and not transparent, you may consider a more full sun location, as from even a short distance, people would not be able to see whats going on inside...

Depending on distance, they might smell what is going on though.

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Old 06-26-2011, 05:29 PM   #3
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Thanks for the reply. Problem is, my GH is already built/located.

Good to know about the light meter.

Has anyone had success growing in a largely shaded GH?

It's getting late in the season, and any replys based on experience from fellow ICMag brothers and sisters would be greatly appreciated.

hgm
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Old 06-27-2011, 09:00 PM   #4
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According to Mel Frank, "[w]hen the plants get bright, indirect light, all they need for good growth is about three or four hours of daily sunlight."

I've seen others post on this site that five hours of direct sunlight may not be enough, based on their experience.

If you read this, and have some personal anecdotes to share regarding lighting, please feel free to tell us what you know.

I think it would be helpful to others who conduct a search to see what experience has to say.

Thanks.
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Old 06-27-2011, 11:54 PM   #5
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What is causing the shade? Can you thin the shade trees?

I'd say go for it, what do you have to loose?

peace
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Old 07-04-2011, 06:14 AM   #6
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In all non plant specific gardening literature I have read, including The California Master Gardeners Handbook, and The Encyclopedia of Gardening; it suggests 6 hours are ideal. Based on my own knowledge about how different intensities effect growth, I'd say less than that would result in looser buds. Which, sometimes can still be acceptable. Especially in denser strains which may otherwise mold with proper lighting in greenhouses. And there's a difference between non direct (or partial i.e through trees) sun, and shade (wall, canopy), to be put into consideration.
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Old 10-10-2011, 11:14 AM   #7
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Hey There Confused peeps,HGM has a good question,

Lets speculate, The SUN (source of most of the Earths natural energy) is far more intense than any Bulb or light made by man, question is how use full is its refracted light?

I am offering up no answers only doubling up HGM's question as I am in the same boat at the moment. But as far as I am assuming the sun should be fine as long as the plant is not in so much dark it thinks it is in fact night time. as long as there is enough sun to illuminate the GH you plants will grow, Its the intensity issue I am worried about as is it worth have plants that simply grow? as I would prefer plants that Thrive and produce not simply grow.

Interested to see some response.

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Old 11-28-2011, 01:30 AM   #8
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Im sorry but must correct you for a little.
There is no speculation and sun arent brighter.
Sun give 50,000 lumen on top of Big Ben and on the ground but any bulb will loose lumens by distance.
Of course sun can not damage plant unless growing under sun arent natural process.

You said well, in shade plant will grow but she will grow under 100W CFL and 600W HPS just result arent same.
Its same for shade and direct sun.

Wont be negative but if we start with Shade, MINIMUM of direct sun etc etc than what to expect ? ... amazing harvest ?

just my 2c
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Old 11-28-2011, 05:12 PM   #9
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make hash with em all. leafy airy buds .
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Old 11-28-2011, 07:19 PM   #10
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Throw up a 1000w hps every 6 feet or so as supplemental lighting. That way you won't have loose buds.

Remember... you can lose a game in safety but you can lose a foot when you loose the hounds.

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Old 11-28-2011, 08:41 PM   #11
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It'll grow I got a sun room that gets maybe 3 to 4 hours of direct sunlight it works not the biggest yielders but cant beat free light. Even a few hours
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Old 11-28-2011, 09:17 PM   #12
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Makeshift GH. Around latitude 33, Winter grow, where average direct light was only about 3 hours a day.

Old Timer's Haze


Light and airy, yes but that's the strain.

Senor Garcia


Maybe a bit more leaf than if run in full sun, but again, this strain did very well with minimal direct sunlight. I find looser more sativa leaning strains to work well in winter greenhouses because the additional rH doesn't cause as much problems with botrytis.

Now go, run and see....
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Old 11-29-2011, 08:43 AM   #13
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I cant wait for you chaps to see my GH i have a thread so look anyways you will see what I mean about the Sun and refracted light...

Strain regardless, remember Im in Africa.

Namaste
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Old 03-06-2012, 11:56 PM   #14
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What if you get great sunlight midday for about 5hrs, is it worth installing supplemental lighting at the start and the end of the cycle(I have a roll on cover that comes off at 7am and back on at 7pm)
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Old 03-07-2012, 02:54 AM   #15
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if you're trying to veg, definitely. if you're just flowering outside, probably. depends on how bad the light is for the other 7 hrs, id imagine.
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