On Tue, 6 Aug 2002, Trevor Boicey wrote:
>
> Nolan Penney wrote:
> > By using an old fashioned unit I don't get flashed. The auto-darkening
> > units have come a long way in their rapid response, but there is still a
> > time lag. That is something I don't like. It especially matters if I'm
> > doing many restarts, as I would get a flash from every restart.
>
> ...define "flash"?
>
>
> There are also batteryless kinds that darken in 1/5000th of a
> second at the same shop, which is slower but even that sounds
> like it would be fast enough to avoid any visible flash...
I've got one of these solar-powered ones. It's a fairly cheap one from HTP,
that was part of the package when I bought my machine. I forget what its
claimed operating time is, but it's plenty fast enough that I don't notice any
flash. One thing to remember is that the ANSI spec (and OSHA regulations)
for auto-darkening helmets requires that they provide UV and IR light
protection at all times.
>
> > The old fashioned units are light weight. While the newer generation
> > of auto darkening shields are much lighter then their ancestors, they
> > still have a good bit of weight.
>
> Again, I really disagree with this. The lens in my auto darkening
> helmet weighs basically nothing, and the rest is just a normal helmet.
Indeed. The element in mine weighs an ounce or two, not much more than
a piece of filter glass would.
> > Repairs and adjustments of the old fashioned units are also very nice.
> > Changing filters and protective glass fronts takes but a minute, and is
> > cheap to do.
Mine has the normal set of adjustments for tightness and flip down force.
It also takes standard sized protective plates.
David
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