Lightfastness info for Epson UltraChrome inks.
The UltraChrome inks provide prints with in excess of 75 years lightfastness, enabling photographic images with the ultimate in photo-reproduction quality, thanks to a combination of media and new inks.

Lightfastness varies by media type as follows:

Premium Semigloss Photo Paper: Over 45 years
Glossy Paper - Photo Weight: Over 45 years
Archival Matte Paper: Over 75 years
Watercolor Paper - Radiant White: Over 75 years
Please see the test conditions below.

Lightfastness Test Conditions

Test Conditions
1. Under fluorescent light (indoor display condition) with glass mount
2. The data is calculated by EPSON's accelerated test and does not mean EPSON guarantees periods
3. The estimated longevity does not indicate the colour changing and the durability of the paper itself

The lightfastness test is a simulation of colour fading in an indoor preservation condition under fluorescent light with glass mount. The display life may vary depending on the conditions that you display your prints. Factors, other than light, such as ozone, temperature and humidity can affect the print life.

For an 'independant' light fastness tests click here - (requires Adobe Acrobat Reader)