Sounds like jokers that try spot welding without bothering to close the
visor on their welding helment. I only actually tried the light in the
mask trick with a standard light. I've since decided that Rick Sankey
was right when he suggested that there wasn't any good reason to go
anywhere that you can scooter with a quad. I'm taking my cue from Sankey.
So, its a mute <sic> point.

On Mon, 8 May 2000, Trey wrote:

> You do not want to look into thes things out of the water, or way close
> in the water. Lamer Endlish had to be taken to the hosptial for suntaned
> retinas after he tried that. About four hours after he looked into it,
> he went blind. I liked him better that way, but he recovered in a few
> more hours. He was looking at an HID next to a halogen to see which was
> brighter - too funny.
> 
> Joel Markwell wrote:
> > 
> > on 5/8/00 3:06 PM, John R. Rose at rose@CS*.SC*.ED* wrote:
> > 
> > > As long as you have a working light and there is water flow, you will have
> > > visual cues. Hold the light right up to your mask. No matter how chocolate
> > > babyshit whatever, the light right up against your mask will allow you to
> > > see the movement of particles. Certainly if there is no perceptable water
> > > flow then this is a mute <sic> point. This is not hearsay. This is my
> > > experience.
> > 
> > John,
> > 
> > So your advice to a cave diver is to hold a HID up to his face? Eyes open or
> > closed? <g>
> > 
> > Determining water flow by blinding oneself does not sound like much of a
> > solution.  If, as you suggest, you're looking for "cues" to flow in a medium
> > to high flow cave aren't there better ways? Can you think of any?
> > 
> > How would one determine flow in a medium to high-flow cave in zero
> > visibility?
> > 
> > More to the point, my solution has been to get on the line in the proper
> > orientation, get in touch contact with my buddy and either continue if the
> > vis was planned for or negotiable or exit if not. During the progress in
> > either direction the vis is likely to improve unless one is "riding the
> > cloud" in which case there are likely going to be moments of swirly vis that
> > pops up. During which any light might help. You contend that the HID light
> > is useful under these conditions. I have to wonder if the backscatter in
> > near-zero vis trying to find vis might not do more harm to one's vision than
> > good.
> > 
> > Not having dove an HID light in zero and/or low vis I'll rely on your
> > experience in this area. I think suggestions that can impact one's ability
> > to keep breathing should be that accurate.
> > 
> > Later,
> > 
> > JoeL
> 
> 
> 

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