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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > How much light is too much?
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Old 01-12-2010, 12:56 AM   #11
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I have used a flashlight to monitor the end of the racking cane during racking, with no real issues. I typically ferment in my upstairs bathroom, which is dark 99.99% of the time, except when I take my daily #2, then I just leave the shower curtain shut. never had an issue.

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Old 01-12-2010, 04:00 PM   #12
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I have used a flashlight to monitor the end of the racking cane during racking, with no real issues. I typically ferment in my upstairs bathroom, which is dark 99.99% of the time, except when I take my daily #2, then I just leave the shower curtain shut. never had an issue.
talk about overkill.
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Old 01-12-2010, 05:15 PM   #13
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seriously.... I brew outside, granted I don't ferment outside, I keep my windows open during transfers and whatnot...

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Old 01-12-2010, 11:04 PM   #14
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seriously.... I brew outside, granted I don't ferment outside, I keep my windows open during transfers and whatnot...
The skunking reaction doesn't happen until fermentation has occurred so brewing outside isn't an issue, but after it can happen extremely quickly. As part of a brewing class I took we purposely skunked a pint of beer to see how quickly we noticed a difference and I could tell a difference in about 3 minutes of direct sun, and after about 15 is was pretty bad.

Of course like I said earlier, a beer in the fermenter isn't going to have the same issues, but it can happen, even with indirect exposure.
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Old 01-13-2010, 02:45 PM   #15
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The skunking reaction doesn't happen until fermentation has occurred so brewing outside isn't an issue, but after it can happen extremely quickly.

I realize that, which is why I said "granted I don't ferment outside".

on the other hand, I thought skunking happened because of alpha acids' reaction with UV light, which means fermentation has nothing to do with it.

Am I right?
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Old 01-13-2010, 02:54 PM   #16
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I don't cover mine at all and I don't notice any skunking. Never had a judge comment about skunking either.

I also don't keep it in bright sunlight. Sometimes it's in the bathroom. It gets some indirect sunlight in there and some light from the fluorescents.

I think indirect exposure is fine. However do not pour yourself a pint of IPA and proceed to sip it on the sun drenched veranda.

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Old 01-13-2010, 11:11 PM   #17
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I realize that, which is why I said "granted I don't ferment outside".

on the other hand, I thought skunking happened because of alpha acids' reaction with UV light, which means fermentation has nothing to do with it.

Am I right?
The yeast provides Vitamin B2 which acts as a photosynthesizer, catalyzing the conversion of oxygen to singlet oxygen. This oxygen then “destroys” isohumulone and in the process radicals are formed. The radical reacts with sulfur containing proteins, forming a thiol called 3-methylbut-2-ene-1-thiol, which is the same chemical found in skunks. Without the yeast present, the reaction can't begin to take place.
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Old 01-14-2010, 12:50 AM   #18
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Originally Posted by BarleyWater View Post
The yeast provides Vitamin B2 which acts as a photosynthesizer, catalyzing the conversion of oxygen to singlet oxygen. This oxygen then “destroys” isohumulone and in the process radicals are formed. The radical reacts with sulfur containing proteins, forming a thiol called 3-methylbut-2-ene-1-thiol, which is the same chemical found in skunks. Without the yeast present, the reaction can't begin to take place.
This should be in the brewing science forum . I wish I could take a brewing class.
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Old 01-14-2010, 12:56 AM   #19
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so using 50 uv led's as a nightlight for the fermenter is a BAD idea?

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