I'd like to see, if the FedEx jerks could get me my package containing a sample
pack. I've heard nothing today. I guess I'll just give up. It's too aggravating
to fool with.
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
-------------- Original message ----------------------
From: Jan Steinman <Jan@xxxxxxxxxxxxxx>
>
>
> > From: Dan Mitchell <danmitchell@xxxxxxxx>
> >
> > If the 61 LED version has 30 degree 18,000 MCD LEDs, the output should
> > be roughly 180-240 lumens. A typical 60 watt incandescent has an
> > output
> > of about 850-900 lumens. This equates an efficiency of about 33 lumens
> > per watt for these LED units. This is much better than the 15
> > lumens per
> > watt most tungsten bulbs average, but not as good as your $3 compact
> > fluorescents from the hardware store which should average about 50-55
> > lumens per watt.
>
> But lumens are misleading -- it's a measure of luminous flux, or
> total field strength.
>
> You really need to express it in terms of "luminance" which has an
> area component. If you express it in lamberts (pi candelas per square
> centimeter), the LED may light a desktop or sink or kitchen range
> more efficiently than a CFB could.
>
> As I said before, LEDs for task lighting, CFBs for area lighting.
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