[10.5.10.6.1] The solar illuminance at a normal incidence on a surface in free space at Earth’s mean distance from the Sun. The current accepted value is 127.5 kilolux (11,850 footcandles).
We are currently experiencing issues with our phone system. While we work to rectify this issue, please visit the IES “about us” page to contact staff members via email.
Thank you for you patience.