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Art, the penetration of the higher frequency.......I am starting to think that email never went out. Speed of light stays the same, so if the frequency goes up, the wavelength goes down. Shorter wavelength, see farther in water. Some call it "blue". On mine the beam is a sabre, and it penetrates. Leon Sinks has all kinds of snot in the water, and after the ocean passes us here, it goes by you up there. Sometimes it is nice, sometimes it is a shitstorm. Art Greenberg wrote: > > On Sun, 25 Jul 1999 kirvine@sa*.ne* wrote: > > > If I were diving New England wrecks, this would be my light of choice > > with a small Extreme Exposure unbreakable canister, and a backup normal > > bulb slug in my pocket. > > George - > > Have you or anyone else actually tried the HID lamp or any other very high > output light in the ocean off NJ/NY? I ask this because we usually have so > much stuff suspended in the water that using a really bright light can > result in so much backscatter that you're better off with something less, > and a narrow beam. Tina and I have 35 watt bulbs in our lights, which > seems to work out fine most of the time. It is very rare that the water is > so clear that 35 watts isn't enough to overcome the ambient light, making > signalling impossible. And inside the wrecks, where the distances involved > are short, its always more than enough. > > -- > Art Greenberg > artg@ec*.ne* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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