Re: can someone explain the candela a little?

J. J. Lodder <nospam@xxxxxxxxxxxxxxxx> writes
>The candela is best forgotten.
>It is a left-over from the days
>when quantitative measurement of intensities
>was difficult or even imposible.
>Nowadays there is no good reason not to use just watts.

Then there are lumens too....

I do agree with the OP that its confusing having an apparently
'fundamental' unit that is in fact completely arbitrary in that
different individuals will see different 'luminous intensities'
differently to others.

Its particularly irritating when different lighting products use
different units to categorise their light output. I think the truly
appalling efficiency of some lighting products (particularly
incandescents) leads manufacturers to obscure the actual light output.

Personally I think watts of visible light is a perfectly good measure
and if further detail is required then a spectral analysis is
sufficient.

One can then make what adjustments one wishes for filters and the
spectral eye response.

--
Oz
This post is worth absolutely nothing and is probably fallacious.

Use oz@xxxxxxxxxxxxxxxxxxxx [ozacoohdb@xxxxxxxxxxxxx functions].
BTOPENWORLD address has ceased. DEMON address has ceased.

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