Author Topic: 8' Fluorescent UV Block Guards?  (Read 2268 times)

Offline kingscreen

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8' Fluorescent UV Block Guards?
« on: May 12, 2015, 02:28:01 PM »
Edit:  Who has 8' bulbs in their darkrooms/screen rooms and what are you using to filter them?  Source?
So far, Litho Gold sleeves seem to be the best option. 

« Last Edit: May 12, 2015, 02:40:37 PM by kingscreen »
Scott Garnett
King Screen


Offline mk162

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Re: 8' Fluorescent UV Block Guards?
« Reply #1 on: May 12, 2015, 02:41:21 PM »
tried them...UV went right through them...

also, you can buy 4 footers and put them together into an 8ft

Offline dirkdiggler

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Re: 8' Fluorescent UV Block Guards?
« Reply #2 on: May 12, 2015, 03:24:44 PM »
if u buy the right ones they work great, call Nazdar!  I love mine.
If he gets up, we'll all get up, IT'LL BE ANARCHY!-John Bender

Offline mk162

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Re: 8' Fluorescent UV Block Guards?
« Reply #3 on: May 12, 2015, 03:25:44 PM »
we switched to the yellow ones and they are fine

Offline sben763

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Re: 8' Fluorescent UV Block Guards?
« Reply #4 on: May 12, 2015, 06:55:58 PM »
Just get some direct replacement 8'LED bulbs and you'll never work in a dark room again. I put 2 screen right next to 4 -4'  coated with Saati PHU for 2 days.  One I just washed and it washed right out, the other I exposed and worked perfect.  The company I get my electrical supplies for my day job said they have zero UV output in the cool-warm white bulbs.

Offline TCT

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Re: 8' Fluorescent UV Block Guards?
« Reply #5 on: May 12, 2015, 07:08:21 PM »
Here is what we use, I know it is for 4' bulbs but they may have 8' ones as well. Or just put 2 4' ones end to end!

http://www.uvps.com/product.asp?code=FILTER+++I
Alex

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Offline mk162

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Re: 8' Fluorescent UV Block Guards?
« Reply #6 on: May 12, 2015, 07:50:58 PM »
careful, the LEDs I have also say zero UV and guess what...it will bake a screen in about 20-30 minutes.  it jacks up our exposure so bad I had to cover them...tried the clear UV sleeves, then put a UV film over that and still wasn't good enough

Offline sben763

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Re: 8' Fluorescent UV Block Guards?
« Reply #7 on: May 12, 2015, 08:34:59 PM »
Quality LEDs won't emitt any UV. And LED in the 3500k-5000k with a CREE or DLC led will emit 0 UV.  Here lately there are tube LED showing up in the big box stores that have multi spectrum. Another thing that could possibly cause issue is if  the retrofit uses the ballast.  All the ones that I have tested you strip out the ballast and rewire for 120v.  They also have a filter and not a open led like others I've seen. 

Due to diffrent conditions, emulsion, environments it is always best to test. 

Offline tonyt79

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Re: 8' Fluorescent UV Block Guards?
« Reply #8 on: May 12, 2015, 09:41:35 PM »
I have 8' fluorescent in my "dark room" no filters on them. Was very worried about it for the few months but couldn't find filters. They are the very skinny bulbs. Don't remember the numbers. I keep my coated screens in a sheet covered rack with no issues. I know some shops that have filters but still keep their screens coated screens covered.

Offline dirkdiggler

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Re: 8' Fluorescent UV Block Guards?
« Reply #9 on: May 13, 2015, 10:02:28 AM »
This is mine and no covers over the screens and I even have a yellow tinted window on the storage side.  ZERO problems.

If he gets up, we'll all get up, IT'LL BE ANARCHY!-John Bender

Offline Gilligan

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Re: 8' Fluorescent UV Block Guards?
« Reply #10 on: May 13, 2015, 03:51:17 PM »
We just did a test and after 12 or so hours we got some resistance at 3 hours of exposure to our florescents.  At 9 hours it was fully cooked and major resistance at 7 and 8 but you could see it was different.

So with our current setup I'd be comfortable with a screen being out for an hour, two hours MAX without any negative effects.  Granted, I can't see any reason that this would happen, but it's good to know your limitations.