On Wed, 07 Jan 2004 18:49:12 GMT, Ernie Leimkuhler
I think I'll call bullshit.
While I'm sure manufacturers could use wavelength specific photo
sensors, and have the helmets ignore all but UV, why would they?
My speedglass helmet will turn on with a flashlight pointed at it, and
I don't think they are considered "cheap" helmets.
HID lamps produce UV as well as visible light, so they have a better
chance of triggering auto darkening helmets than an incandescent bulb
WHAT I MEANT...
Was that good LCD lenses are adjustable so you can set them not to
react to ambient light, no matter what kind it is.
My Nexgen lens allows me to perform low amp TIG welds in bright
John Mirely wrote: Are all auto darkening filters turned on by HID
What does HID stand for? I think I have the idea from the context, but I'd
still like to know.
When I was shopping for an auto darkening helmet, the dealer made it darken
with a flint striker. I was told that it is the spikey nature of the light
that does it, not the brightness or wavelength.
I think you are correct but I don't know if it is true for all makes and
models and I also don't know if that is just the easiest way to trigger the
darkening. In other words, will it darken in the presence of high-intensity
steady light? Other factor is the sensitivity to certain parts of the
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