LED lights with yellow sleeves in the screen room?

[blue moon]

we used sheets of this - F007-011NA

http://www.uvprocess.com/product.asp?code=FILTER+++L

i cut it to fit and taped it to the plastic diffuser on our drop ceiling light fixtures...

no need to mess with sleeves.

If you look at the specs, that film only blocks 90% of the UV. It is not safe to leave those lights on all the time.

pierre

ive never had a problem...

which specs were you looking at? 
i saw that it blocked:  Amber UV Filter - 99% 200nm through 470nm and 80% 470nm to 500nm

i thought our emulsions were light sensitive somewhere between 380 and 420nm   - and thats what i saw when i bought the films a few years ago...   

first pdf download on the left.

http://www.uvprocess.com/products/MAINTENANCE%20AND%20SHOP.C3.UV%20FILTER%20MATERIALS.FILTER/CON-TROL-CURE%20UV%20BLOCKING%20AMBER%20FILMS%20OR%20FOILS.FILTER%20%20%20L//Datasheets/amber%20graph.pdf

this one shows the graph for their amber sleeves (unless I am missing something).
They are also selling a cheap UV meter that is advertised as having a range up to 400nm. Since i have the same thing I know that at 400nm it has no sensitivity since that is the end of it's curve. It cuts of anything emitted in that range by 99% or more. They might be catering to the industries which are working in the mid 300nm range unlike our emulsions which are still sensitive at 420 (not much, but they are). Additionally, some of the LED exposure units on the market are actually using 405nm bulbs right in the frequency where the sleeves provide least protection.

where did you find the info that they block 99%? I looked around and can't find it. . .

pierre

[Zelko-4-EVA]

we used sheets of this - F007-011NA

http://www.uvprocess.com/product.asp?code=FILTER+++L

i cut it to fit and taped it to the plastic diffuser on our drop ceiling light fixtures...

no need to mess with sleeves.

If you look at the specs, that film only blocks 90% of the UV. It is not safe to leave those lights on all the time.

pierre

ive never had a problem...

which specs were you looking at? 
i saw that it blocked:  Amber UV Filter - 99% 200nm through 470nm and 80% 470nm to 500nm

i thought our emulsions were light sensitive somewhere between 380 and 420nm   - and thats what i saw when i bought the films a few years ago...   

first pdf download on the left.

http://www.uvprocess.com/products/MAINTENANCE%20AND%20SHOP.C3.UV%20FILTER%20MATERIALS.FILTER/CON-TROL-CURE%20UV%20BLOCKING%20AMBER%20FILMS%20OR%20FOILS.FILTER%20%20%20L//Datasheets/amber%20graph.pdf

this one shows the graph for their amber sleeves (unless I am missing something).
They are also selling a cheap UV meter that is advertised as having a range up to 400nm. Since i have the same thing I know that at 400nm it has no sensitivity since that is the end of it's curve. It cuts of anything emitted in that range by 99% or more. They might be catering to the industries which are working in the mid 300nm range unlike our emulsions which are still sensitive at 420 (not much, but they are). Additionally, some of the LED exposure units on the market are actually using 405nm bulbs right in the frequency where the sleeves provide least protection.

where did you find the info that they block 99%? I looked around and can't find it. . .

pierre

its the third download on the left

http://www.uvprocess.com/products/MAINTENANCE%20AND%20SHOP.C3.UV%20FILTER%20MATERIALS.FILTER/AMBER%20UV%20PRODUCTS.FILTER%20%20%20M//SupportDocs/UV%20BLB%20Scan%20for%20Amber.pdf

its describing the products ability to block black light "Above UVA/Visible Black Light Bulb"

i figured that since some expose with blacklight blubs, that if this product blocked those nm range, it would work for us. 

i havent had any problems yet, but now you have got me doubting myself.

[bimmridder]

Do the quarter test. Or nickels if you're on a tight budget.

[RICK STEFANICK]

I have used yellow sleeves for years including LED'S. Never had a problem, Never thought about it being a problem and never will be a problem. Pop them on and get onto making money screen printing

[blue moon]

I have used yellow sleeves for years including LED'S. Never had a problem, Never thought about it being a problem and never will be a problem. Pop them on and get onto making money screen printing

Rick, just because it was not a problem for you, it does not mean such is the case for the others. If the screens in a storage room are exposed to UV, they will be partially exposed and they will vary  in how much time they need for full exposure, will have problems holding repeatable dots and in general be pretty unpredictable. We are talking minor variances, but enough to cause real problems. 
No question about it, do a coin test as suggested by Dave.

Pierre

[Maxie]

Is there is film on the market that will block 100% of the UV?