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Donna - Ok, I can see what they are doing, although I do not totally
agree with the way they are calculating the shade number.
As I mentioned in my previous note, one of the key factors in
determining the shade number is the maximum visible light
transmission, which for a shade 5 is 3.16%. What I believe that
Gentex is doing is modifying the typical welders filter curve (which
looks like a standard distribution curve) in such a way to transmit
light centered in the orange/yellow wave bands (560 to 600 nm) and
lowering the transmission in the rest of the visible light bands to
achieve the overall 3.16% visible light transmission. There is
nothing wrong or illegal or anything with doing this, and it does
achieve the purpose of allowing "more" light through the filter
(actually, the more "brilliant" colors), however, for metal working,
you really want to cut the yellow sodium flare at 575 nm, not enhance
it (this is what a didymium filter does). The standard welders filter
peaks at about 536 nm, so what they have done is shifted the
transmission spectrum towards the IR by about 50-60 nm.
I have nothing against Gentex, as I said they are a well-known
company with a good reputation. However, I don't personally believe
that this particular filter is a good thing. The yellow flare that
comes from sodium burning off is distracting and annoying and all
this filter does is allow more of it to pass through.
Anyway, that is my $0.02.
Mike Aurelius
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