ICH requirement-calculation of light intensity

Hello,

Can you guide me on the ICH requirement / calculation of light intensity, fluorescent and UV, exposure to samples.

If you can suggest some internet link where i can obtain detailed information, that would be great.

Regards

Please check this

http://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/ucm073373.pdf

Thank you DURGA PRASAD very helpful