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Date: Sun, 25 Jul 1999 08:14:58 -0400
To: 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 07:06 AM 7/25/99 , kirvine@sa*.ne* wrote:
>18 watts. The reason I used the "..." for terms like "bright" is that we
>are talking the "effect" that we call "light" in water, chief. I just
>explained what is really going on, and that is the reason you can "see"
>further and "think" the light is brighter. The rest is horsehit.
>
>Also know that they are putting most of their energy out in the form of
>light, not heat, so you can turn them on out of the water without
>worrying about meltdown.

Just for the sake of argument... The big reason that you've got more light 
chief is because you have an 18 watt HID bulb that's putting out the same 
amount of light as a 100 watt tungsten bulb - 80% of its energy becomes 
light, the opposite is true of tungsten. Not so much because you've got a 
higher color temp but because you've got more brightness. If color temp was 
the only factor you could simply put a dichroic or CTB filter on a quartz 
lamp to achieve the same effect.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mark Melendez
melendez at bigfoot dot com
http://www.bigfoot.com/~melendez



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<html>
<font size=3>At 07:06 AM 7/25/99 , kirvine@sa*.ne* wrote:<br>
<blockquote type=cite cite>18 watts. The reason I used the
"..." for terms like "bright" is that we<br>
are talking the "effect" that we call "light" in
water, chief. I just<br>
explained what is really going on, and that is the reason you can
"see"<br>
further and "think" the light is brighter. The rest is
horsehit.</font><br>
<br>
Also know that they are putting most of their energy out in the form
of<br>
light, not heat, so you can turn them on out of the water without<br>
worrying about meltdown.</blockquote><br>
Just for the sake of argument... The big reason that you've got more
light chief is because you have an 18 watt HID bulb that's putting out
the same amount of light as a 100 watt tungsten bulb - 80% of its energy
becomes light, the opposite is true of tungsten. Not so much because
you've got a higher color temp but because you've got more brightness. If
color temp was the only factor you could simply put a dichroic or CTB
filter on a quartz lamp to achieve the same effect.<br>
<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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