The Orchid Forum, for the UK and Europe (previously known as The UK Orchid Forum) • View topic - Polycarbonate layers
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 Post subject: Polycarbonate layers
PostPosted: Mon Jun 19, 2017 9:16 am 
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Hi,

Often hear about triple walled polycarb being recommended for an orchid housing, but as my south facing greenhouse already has some 10mm twinwalled as the main glazing, if I make an orchid enclosure using more 10mm twinwall, would those four layers create too much shading effect for things like phals and paphs ?

The orchid enclosure would be independent and at least an inch apart from the greenhouse glazing.

thanks.


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 Post subject: Re: Polycarbonate layers
PostPosted: Sat Jul 01, 2017 4:58 pm 
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For anyone interested :-

Been able to get hold of a Lux meter and after a long wait for a sunny day after this weeks rains, have measured the light through two lots of 10mm tw polycarb, separated by at least 20mm, and the light readings around the plants are still well above** the suggested* 10,000 to 16,000 Lux at Midday .

* mid summer and full sun, for low light species like phaps and phals.

** Will probably have to use some whitewash or light netting to bring it down a bit.


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 Post subject: Re: Polycarbonate layers
PostPosted: Sat Jul 01, 2017 6:51 pm 
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Ricky, I have found that clear polycarbonate gradually goes opaque over time. I assume that this will cut down on light transfer as time passes, so keep an eye on it.

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 Post subject: Re: Polycarbonate layers
PostPosted: Sat Jul 01, 2017 9:42 pm 
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Phals are low light growers but does this mean they are low light growers in the tropics when I assume their low light could be our bright light. I grow all my Paphiopedilums in the highest light I can give them. The greenhouse is 4mm toughened glass followed by a 10mm gap and then 12mm polycarbonate then another 10mm gap and finished with large UV bubble wrap ---- the light is spot on for the species I grow.
Ed.



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 Post subject: Re: Polycarbonate layers
PostPosted: Sun Jul 02, 2017 9:38 am 
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phraggy wrote:
Phals are low light growers but does this mean they are low light growers in the tropics when I assume their low light could be our bright light. I grow all my Paphiopedilums in the highest light I can give them. The greenhouse is 4mm toughened glass followed by a 10mm gap and then 12mm polycarbonate then another 10mm gap and finished with large UV bubble wrap ---- the light is spot on for the species I grow.
Ed.


Sounds like your three layers will obscure at least as much light as 2 layers of 10mm twinwall, so seems I should be ok.

thanks


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 Post subject: Re: Polycarbonate layers
PostPosted: Mon Jul 03, 2017 3:34 pm 
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ricky wrote:
phraggy wrote:
Phals are low light growers but does this mean they are low light growers in the tropics when I assume their low light could be our bright light. I grow all my Paphiopedilums in the highest light I can give them. The greenhouse is 4mm toughened glass followed by a 10mm gap and then 12mm polycarbonate then another 10mm gap and finished with large UV bubble wrap ---- the light is spot on for the species I grow.
Ed.


Sounds like your three layers will obscure at least as much light as 2 layers of 10mm twinwall, so seems I should be ok.

thanks


Don't worry about the amount of light you give them they will adapt to whatever you throw at them, they only thing that they will not adapt to is incorrect watering.
Ed.


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 Post subject: Re: Polycarbonate layers
PostPosted: Mon Jul 03, 2017 8:48 pm 
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Quote:
Don't worry about the amount of light you give them they will adapt to whatever you throw at them, they only thing that they will not adapt to is incorrect watering.
Ed.


I grew a variety of orchids in a larger greenhouse some years ago, so hopefully can keep on the right side of watering :)

The biggest difference / problem is that then, you could go round the garden centers and pick up a good selection of orchids that had finished flowering quiet cheaply but now they seem to have very limited stocks of any orchids; perhaps a result of all the supermarkets selling phals for as little as £5...


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