RE: ATM Brightness of LED

[Dominic-Luc Webb <dlwebb@canit.se>]

On Fri, 29 Aug 2003, Frank Ward wrote:

> Oh, Dominic, now you have them going. Soon
> we'll have some abstract test to compare
> the luster on mirrors....all because of you! *S*
> I can hear it now,

> for instance) By adjusting the sensitivity you could
> use it on a mirror, but you would have to have a
> standard source.


Not always a waste of time, and actually, if you use a
voltage regulator, the LED has pretty constant photon flux.
I have done such a test and decided to polish further after
I had the correct figure based on such measurement, with
the subsequent observation of greater reflectivity. I do not
have absolute % reflectivity values, but can notice a point
of diminishin returns where a further hour of polishing
gives no increase in reflectivity. I feel confident to say
that if you polish for an additional hour and see no gain
on such a meter, you are done. Conversely, if you see it
double after one hour, you need more polishing.

Dominic