Digital BW, The Print

I am a jestful mood today. But, once calibrated, some paper/ink 
combinations would make pretty good cumulative light meters.

This is fun!

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Greg" 
<dfaprinting@y...> wrote:
>
> I know there are a few meters that work in conjunction with a 
> computer, so in theory you could monitor the amount of light during a 
> very long interval. Check the Jensen tools catalog, they used to 
> carry things like this. Also in theory you could calibrate either a 
> photovoltaic cell or a photoresistor and an A to D converter to 
> report back to a computer. You could also set up some photovoltaic 
> cells to run an hour meter, the lower the voltage, the slower the 
> meter runs, the higher the faster (etc.). To do it correctly, you 
> also need to know the spectrum of the light in addition to the 
> amount, now you are talking much more money.
>