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Main
Date: 22 Aug 2006 17:59:02
From: Dan Logcher
Subject: Yeast and Light
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I know I've read here that yeast do not handle direct sunlight
very well. How much natural, not direct, light can it handle?
Right now I keep my fermentors in the basement, which is mostly
dark. But it is also colder, 64-68 degrees. My kitchen is
warmer, but has a fair amount of natural light from windows.
Any thoughts?
--
Dan
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Date: 23 Aug 2006 12:37:32
From: rb
Subject: Re: Yeast and Light
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Dan Logcher wrote:
> I know I've read here that yeast do not handle direct sunlight
> very well. How much natural, not direct, light can it handle?
> Right now I keep my fermentors in the basement, which is mostly
> dark. But it is also colder, 64-68 degrees. My kitchen is
> warmer, but has a fair amount of natural light from windows.
>
> Any thoughts?
>
http://www.americanairandwater.com/uv-facts/uv-dosage.htm
See bottom of page (brewers yeast)
How does this relate back to natural light? Dunno.
Note that food grade plastic is generally UV stabilised and would
probably filter out most UV. Glass OTOH doesn't. But I would think that
the skunking issue would be more pressing than yeast death from UV
irradiation.
rb
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Date: 23 Aug 2006 19:40:37
From: John 'Shaggy' Kolesar
Subject: Re: Yeast and Light
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On Wed, 23 Aug 2006 12:37:32 +1000, <snafu_1@lycos.com > wrote:
> http://www.americanairandwater.com/uv-facts/uv-dosage.htm
>
> See bottom of page (brewers yeast)
> How does this relate back to natural light? Dunno.
I don't know how it relates either, but I've never heard of anyone
killing yeast just with sunlight. IMO, I think you'd probably need
to hit it specifically with a UV lamp or something like that in order
to really get that high of a dosage.
John.
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Date: 23 Aug 2006 01:47:12
From: John 'Shaggy' Kolesar
Subject: Re: Yeast and Light
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On Tue, 22 Aug 2006 17:59:02 -0400, <dlogcher*xspam*@comcast.net > wrote:
> I know I've read here that yeast do not handle direct sunlight
> very well. How much natural, not direct, light can it handle?
> Right now I keep my fermentors in the basement, which is mostly
> dark. But it is also colder, 64-68 degrees. My kitchen is
> warmer, but has a fair amount of natural light from windows.
>
> Any thoughts?
I don't know of any issue regarding yeast and light. Are you thinking
of hops and light? Direct sunlight or flourescent light will cause hops
to "skunk". Incandescent light will not cause this.
BTW, I would consider the basement to be a great temp for fermentation. I
wouldn't want to get it much warmer.
John.
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Date: 22 Aug 2006 17:13:36
From: The Artist Formerly Known as Kap'n Salty
Subject: Re: Yeast and Light
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Dan Logcher wrote:
> I know I've read here that yeast do not handle direct sunlight
> very well. How much natural, not direct, light can it handle?
> Right now I keep my fermentors in the basement, which is mostly
> dark. But it is also colder, 64-68 degrees. My kitchen is
> warmer, but has a fair amount of natural light from windows.
>
> Any thoughts?
>
My understanding was that hop acids have issues with light (skuniness is
a hop compund<- >UV reaction) -- not yeast.
Note that 64-68 degrees is pretty much perfect for most ales, although
belgians may want warmer.
--
(Replies: cleanse my address of the Mark of the Beast!)
Teleoperate a roving mobile robot from the web:
http://www.swampgas.com/robotics/rover.html
Coauthor with Dennis Clark of "Building Robot Drive Trains".
Buy several copies today!
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Date: 22 Aug 2006 21:11:36
From: Dan Logcher
Subject: Re: Yeast and Light
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The Artist Formerly Known as Kap'n Salty wrote:
> Dan Logcher wrote:
>
>> I know I've read here that yeast do not handle direct sunlight
>> very well. How much natural, not direct, light can it handle?
>> Right now I keep my fermentors in the basement, which is mostly
>> dark. But it is also colder, 64-68 degrees. My kitchen is
>> warmer, but has a fair amount of natural light from windows.
>>
>> Any thoughts?
>>
>
> My understanding was that hop acids have issues with light (skuniness is
> a hop compund<->UV reaction) -- not yeast.
I thought UV killed the yeast too..
> Note that 64-68 degrees is pretty much perfect for most ales, although
> belgians may want warmer.
Well ok then, I guess I don't need to move it upstairs.
I was also interested in watching the fermentation day to day.. but I guess
I can skip that or setup a web cam :)
--
Dan
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Date: 23 Aug 2006 01:48:21
From: John 'Shaggy' Kolesar
Subject: Re: Yeast and Light
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On Tue, 22 Aug 2006 21:11:36 -0400, <dlogcher*xspam*@comcast.net > wrote:
> The Artist Formerly Known as Kap'n Salty wrote:
>> Dan Logcher wrote:
>>
>>> I know I've read here that yeast do not handle direct sunlight
>>> very well. How much natural, not direct, light can it handle?
>>> Right now I keep my fermentors in the basement, which is mostly
>>> dark. But it is also colder, 64-68 degrees. My kitchen is
>>> warmer, but has a fair amount of natural light from windows.
>>>
>>> Any thoughts?
>>>
>>
>> My understanding was that hop acids have issues with light (skuniness is
>> a hop compund<->UV reaction) -- not yeast.
>
> I thought UV killed the yeast too..
Not that I know of.
>> Note that 64-68 degrees is pretty much perfect for most ales, although
>> belgians may want warmer.
>
> Well ok then, I guess I don't need to move it upstairs.
> I was also interested in watching the fermentation day to day.. but I guess
> I can skip that or setup a web cam :)
You can just sneak downstairs to take a peak. That's what I do. ;)
John.
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Date: 23 Aug 2006 00:30:22
From: Dan Logcher
Subject: Re: Yeast and Light
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John 'Shaggy' Kolesar wrote:
>
> You can just sneak downstairs to take a peak. That's what I do. ;)
Yeah, but it would be cool to have it upstairs so I can just sit back
on the couch and see what's going on. I have an unfinished basement
so its not as hospitable. Some day I'll make it a game room/bar, once
the kids are in college or something.. like 14 years from now.
--
Dan
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Date: 23 Aug 2006 08:32:31
From: The Artist Formerly Known as Kap'n Salty
Subject: Re: Yeast and Light
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Dan Logcher wrote:
> The Artist Formerly Known as Kap'n Salty wrote:
>
>> Dan Logcher wrote:
>>
>>> I know I've read here that yeast do not handle direct sunlight
>>> very well. How much natural, not direct, light can it handle?
>>> Right now I keep my fermentors in the basement, which is mostly
>>> dark. But it is also colder, 64-68 degrees. My kitchen is
>>> warmer, but has a fair amount of natural light from windows.
>>>
>>> Any thoughts?
>>>
>>
>> My understanding was that hop acids have issues with light (skuniness
>> is a hop compund<->UV reaction) -- not yeast.
>
>
> I thought UV killed the yeast too..
Enough UV will kill anything (UV lamp exposure is sometimes used as a
germicide) -- but the ambient sunlight in your kitchen shouldn't pose a
problem. I'd definitely keep it in the basement, though -- temps are better.
--
(Replies: cleanse my address of the Mark of the Beast!)
Teleoperate a roving mobile robot from the web:
http://www.swampgas.com/robotics/rover.html
Coauthor with Dennis Clark of "Building Robot Drive Trains".
Buy several copies today!
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Date: 23 Aug 2006 11:37:05
From: Dan Logcher
Subject: Re: Yeast and Light
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Thanks for the input on light and temp.
I'll leave the fermentors in the basement.
--
Dan
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Date: 23 Aug 2006 08:14:31
From: Richard Kaszeta
Subject: Re: Yeast and Light
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Dan Logcher <dlogcher*xspam*@comcast.net > writes:
> I know I've read here that yeast do not handle direct sunlight
> very well. How much natural, not direct, light can it handle?
> Right now I keep my fermentors in the basement, which is mostly
> dark. But it is also colder, 64-68 degrees.
A.k.a. perfect for most ales. Don't move them.
--
Richard W Kaszeta
rich@kaszeta.org
http://www.kaszeta.org/rich
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