this info. plus that in the color list are precisely the kinds of
information i think should be worked out and circulated.  so any of you
guys willing and able to do this kind of research would be much
appreciated.

Kari Kivisalo wrote:
> 
> ryan constantine wrote:
> >
> > do these take into account brightness intensities or just colors?
> 
> Well, I haven't dig up most of the intensity data but here's an example:
> 
> One standard candle:             13 lumens
>   60 watt incandescent lamp:  1 000 lumens
> 1500 watt incandescent lamp: 34 000 lumens
> 
> So a 60w light is 80 times brighter than one candle.
> 
> Light `flow' from a lamp is measured in lumens. A uniform point source
> of one candela (luminous intensity in any direction [defined for 555 nm
> radiant intensity of 1/683 watt per steradian] ~ one dinner candle) at the
> center of sphere of 1 foot radius gives 1 lumen per square foot. This is
> also one lumen per steradian. Area of the one foot sphere is 12.57 sq. ft.
> so the 1 cd. source produces 12.57 lumens.
> 
> ______________________________________________________________________
> Kari Kivisalo                                  http://www.kivisalo.net

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