How Long Will Your Digital Prints Image Maintain?

Light Fade
For most types of digital photo prints light fade is the dominant factor to consider when predicting display permanence (an exception is dye-based ink jet prints made on instant-dry photo papers). To accelerate light fade, scientists construct very bright chambers that maintain a temperature and relative humidity similar to a typical home. Photographers who want to be confident about light fade predictions based on the Wilhelm standard should be aware of several points: 
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First, the Wilhelm calculation assumes a brightly lit indoor room--450 lux average for 12 hours per day. The published Kodak method assumes a less brightly lit room--120 lux/12 hours per day. Thus, the Kodak method will predict more years of lightfastness than the Wilhelm method.
 
Second, the Wilhelm standard also uses a stringent definition of failure--the tests are conducted until just a noticeable amount of fading has occurred, and 17 failure criteria are tracked. 
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Finally, as a reality check, long-term (>1 year) "slow fade" rate studies are conducted in light chambers that are only 2-10 times brighter than the nominal real-world condition.
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