Re: [ATM] LED's and Diode Electronics

["David Harbour" <scarab2@cox.net>]

WATTS, WATTS, WATTS, WATTS.

Our inroads on the earth's resources for testing mirrors is trivial.


Try: WATTS! You will love it; I GUARANTEE IT!

Dave

P.S.- to diffuse the filmanet, so that the tester does not make an aeriel
image of the filament, do two things: first, work over the little light bulb
with 220 grit abrasive, and then, after mounting it, make sure that you have
put some Scotch brand "magic tape" on the back side of the slit. All of this
works so well you will never go back to these faddish LED games.

Dave


----- Original Message ----- 
From: "Bruce MacDonald" <brumac@gmail.com>
To: "David Harbour" <scarab2@cox.net>
Sent: Saturday, June 18, 2005 1:02 PM
Subject: Re: [ATM] LED's and Diode Electronics


"there is a time and a place for everything".
Maybe LEDs don't do so well at the beach, but back in the gym they're
improving daily.  I don't need to tell this group about the practical
shortcomings of incandescent filaments, but consider this:

Tungsten is not all that common in the earth's crust:
http://en.wikipedia.org/wiki/Abundance_of_the_chemical_elements

More common than gold, maybe, but it is concentrated in only a few
locations.
We take those concentrations, make heating elements (that give off a
little light) from it, then throw it in landfills.

Silicon, OTOH, is extremely abundant, and the amount of the more rarer
elements need is extremely small.

As the cost of power goes up (and up and up) and the scarcity of
tungsten increaes, we'll be very glad of LEDs

Now, back on topic - more or less.
I understand that a diffuse light source is preferred.  What about
flourescents?
Would it help or detract if the light source was a discrete
wavelength?  I'm thinking discharge tubes?

-BM

On 6/18/05, David Harbour <scarab2@cox.net> wrote:
> Richard,
>
> I've already been there, and wrote about it in a previous post. My lamp,
in
> my testor, was so bright, I COULD NOT TEST COATED MIRRORS WITH IT.
>
> Where has everybody been? TRY THE INCANDESCENT FILAMENT.
>
> Dave
>
> "If it ain't broke, don't fix it"
>
> How can you improve on the wheel? Better bearings? Been around a hundred
> years. How can you improve on a tungsten filament? Not possible. LEDs?-
> Trash can 'em. LEDs get sand kicked in their faces at the beach. They are
> "90 lb weaklings". They know it and won't go to the beach with a girl.
>
> Dave


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