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on 5/8/00 2:43 PM, John R. Rose at rose@CS*.SC*.ED* wrote: > > You really need to try one of these in crap visibility with tanic stained > lines. The HID light is incredible. It is as though it slices through > crap water and locks onto the line without all the backscatter you would > see with a normal bulb. If you are imagining this as simply a brighter > then you are mistaken. Extrapolation from what you've experienced with > standard bulbs doesn't hold. > > BTW, I can't imagine why you would want to close your eyes, particularly > if you are suffering from vertigo. The way to deal with vertigo is to find > some visual cue. The movement of silt that you can see half an inch or so > from your mask with your light on is such a cue. The last thing you want > to do when suffering vertigo is to close your eyes. John, Again, crap vis isn't no vis. Doesn't anyone read anymore? Bright, yes, slice through "crap vis", sure. Offer any help in NO-VIS/ZERO-VIS/CHOCOLATE-MILK-VIS I am as yet unconvinced of and as yet no one has stated flatly that with an HID light you can see _through_ the above-stated conditions in any useful way. BTW, I've seen the HID light in use, underwater, in caves. As to the best way to combat vertigo, I have always been taught that when visual cues are lacking to the extent that your eyes are useless, that closing them can be helpful in recovering your equilibrium. What that is, I don't know. IF that is, I can't say. If you HAVE no visual cues, what then? Other input other than hearsay would be appreciated. Later, JoeL
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