Digital BW, The Print

> 
> Museum @ 50 Lux for 10 hrs
> --------------------------------
> 500 Lux/day -> 182,500 Lux/year
> 55 museum years
> 
> 
> Home/Office @ 450 Lux for 12 hrs
> ----------------------------------
> 5400 Lux/day -> 1,971,000 Lux/year
> 5 Wilhelm years
> 
> Amazing that a typical home/office environment is that much brighter
> (9x) than museum lighting, I never would have guessed that much. 
> Anyway, W rates unprotected VFA/ABW at 112 years.  In museum 
lighting
> that would be about 1200 years.
> 
> If my 100 hrs represents 5 W. years, then it would take about 
another
> 2200 hours to reach 112 W. years.  That certainly puts things into
> perspective. (someone please correct me if my math is wrong).
> 
> We must remember that W's rating is based on a certain amount of
> acceptable change.  So it doesn't mean that a print won't show any
> changes until that point.  I'll continue my testing and will report
> back when the image begins to show some changes.  As for OBA issues,
> I'm wondering if there will be any further changes beyond the barely
> noticeable amount we have at this point...
> 
> Any comments?  
> 
> 
> Regards,
> Clayton
> 

Hi Clayton,

My info came from the info Livik published sometime ago. A friend of 
his did the work in Southern Califronia.

You're located more south than So., Cal. I would assume. So, maybe 5-
10% more exposure? But that's only a guess.

I know that my own home only has about 200 Lux on a bright day. 

Livik published a way to determine the LUX reading for a given 
location using a lightmeter. I'll dig around and see if I can find it 
for you.

Scott