🚀 go-pugleaf

In article <assodi$1k$1@thorium.cix.co.uk>, h.lewis@connect-2.co.uk 
mentioned...
> 
> "Frontline Electronics" <frontline_electronics@NSworldnet.att.net> wrote in
> message news:AVdI9.46878$hK4.4113863@bgtnsc05-news.ops.worldnet.att.net...
> > The only spec I remember is distance that it can be seen from
> > but color temp may have been one.
> > Jeff
> >
> 
> What spec is 'distance it can be seen from'? How is this spec'd?

Yeah, kind of subjective.  I've been playing around with the solar cells 
I got from All Electronics, and I find out that there is a huge 
difference between daylight and indoor light as far as cell output goes.  
Of course I already know that this is to be expected; you won't get a 
suntan from an incandescent desk lamp.  But think about this.  The cell 
puts out, say, 3.16V and .316 mA at 1 ft from the desk lamp, which is 
about 1mW.  So I point the desk lamp down the street and go down this 
long theoretical street 10 thousand feet, and the desk lamp can clearly 
"be seen from this distance", but think about this.  Using the inverse 
square law, the amount of desk lamp light hitting the photocell is 
10000^2 or 100 million times _less_ than at 1 ft, or something like 10 
picowatts.  And the eye's iris is much smaller than the photocell, so it 
has much less than that.  Yet the lamp can be seen clearly from this 
distance, and probably much farther.  So it's really quite amazing how 
sensitve the eye is.


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