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Old 01-18-2008, 07:08 PM   #1
explosivebeer
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Default UV Light During Fermentation

The most convenient place to keep my carboys is in a room that gets ample sunlight on a daily basis. They are never exposed to direct sunlight but I was just curious if anyone knew whether or not the ambient light is detrimental to the beer.

I haven't had any issues, but since I know light can negatively affect beer after fermentation, it stands to reason that it could do the same during fermentation.

So is ambient UV light an issue or only direct UV light?

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Old 01-18-2008, 07:11 PM   #2
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Try to avoid light exposure, the way I figure it is why risk it... Just put a dark T-shirt over the carboy

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Old 01-18-2008, 07:15 PM   #3
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Cover them.

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Old 01-18-2008, 07:16 PM   #4
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old T-shirts work awesome, +1 for them.

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Old 01-18-2008, 07:24 PM   #5
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I try to avoid both direct and indirect light. The cardboard boxes that the carboys come in also work well for blocking light (I just flip them over and cut a hole for the carboy neck/airlock).

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Old 01-18-2008, 07:33 PM   #6
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I flip those boxes over, too, but I find they stand up just fine on the box lid flaps, so that I don't have to cut a whole for the airlock.


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Old 01-18-2008, 07:37 PM   #7
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Quote:
Originally Posted by explosivebeer
I haven't had any issues, but since I know light can negatively affect beer after fermentation, it stands to reason that it could do the same during fermentation.
It's the hop oils that have a problem with light, so pre fermentation, post fermentation, doesn't matter, you need to protect it from light, especially sunlight or florescent lights.
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Old 01-18-2008, 08:08 PM   #8
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Thanks for the information everyone. I suspected that was the case but just wanted to hear what other peoples' thoughts on it. I'll get them covered up one way or another.

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Old 01-19-2008, 02:05 AM   #9
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I place a Large Black Trash Bag over the carboy. Primary and secondary both the the Bag treatment.

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Old 01-19-2008, 12:43 PM   #10
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Last time I was at mom and stepdad's, my step-dad had his carboy sitting in the open living room. I woke up one morning to see the carboy with sunlight streaming through it like that scene in Raiders of the Lost Ark when Indy was in the Well of the Souls searching for the Ark. NOooooooooo! I rushed to find one his tshirts and found a hideous tiedye tshirt to put over it. He told me he does that a lot (leaves the primary in the living room). I told him I hope he likes skunky beer.

So now all of his brews get the tie-dye treatment too

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