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Date: Sun, 25 Jul 1999 22:16:05 -0400
To: john.r.strohm@bi*.co*, kirvine@sa*.ne*
From: Mark Melendez <melendez@bi*.co*>
Subject: Re: HID Lights
Cc: cavers@cavers.com, techdiver@aq*.co*
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At 08:21 PM 7/25/99 , john.r.strohm@BI*.co* wrote:
>George is absolutely correct when he says that blue light penetrates water
>more effectively than red light.  The Navy was doing some experimenting a
>while back using lasers to communicate with submerged submarines: they used
>blue-green argon lasers for precisely that reason.

Agreed. Thought an HID bulb only burns about 1000 degrees Kelvin cooler 
than a Quartz-Tungsten. That's cooler but not that much more on the blue 
side. It's still not as blue as daylight. I still contend that the fact 
that the HID burns so much more  efficiently for it's size is what makes it 
desireable. To have an 18 watt bulb that puts out the same amount of light 
as a 100 watt quartz bulb while at the same time drawing less than 2 Ah is 
why it sounds like a good thing. Not so much the color temp. It burns at 
around 4000 degrees Kelvin. If it was something like 10,000 degrees Kelvin 
then the "high frequency light" thing would be more believable
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark Melendez
melendez at bigfoot dot com
http://www.bigfoot.com/~melendez



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<html>
<font size=3>At 08:21 PM 7/25/99 , john.r.strohm@BI*.co* wrote:<br>
<blockquote type=cite cite>George is absolutely correct when he says that
blue light penetrates water<br>
more effectively than red light.  The Navy was doing some
experimenting a<br>
while back using lasers to communicate with submerged submarines: they
used<br>
blue-green argon lasers for precisely that reason.</blockquote><br>
Agreed. Thought an HID bulb only burns about 1000 degrees Kelvin cooler
than a Quartz-Tungsten. That's cooler but not that much more on the blue
side. It's still not as blue as daylight. I still contend that the fact
that the HID burns so much more  efficiently for it's size is what
makes it desireable. To have an 18 watt bulb that puts out the same
amount of light as a 100 watt quartz bulb while at the same time drawing
less than 2 Ah is why it sounds like a good thing. Not so much the color
temp. It burns at around 4000 degrees Kelvin. If it was something like
10,000 degrees Kelvin then the "high frequency light" thing
would be more believable </font><br>
<div>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</div>
<div>Mark Melendez</div>
<div>melendez at bigfoot dot com</div>
<div><a href="http://www.bigfoot.com/~melendez"
EUDORA=AUTOURL>http://www.bigfoot.com/~melendez</a></div>
<br>
<br>
</html>

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