Dear Malcolm, A full verification of a light source, as Mr. Claas Bickeböller has said, requires a device like Instrument Systems CAS 140CT-152 (with a range of 200 to 800 nm) which is beyond the reach of the typical printer. The manufacturers have to take care of the ISO 3664:2009 compliancy of the luminaire. Best, Refik -------------------------------------------------------- Refik Telhan, EE B.Sc. Light and Color Management Consultancy Aydogdu Sokak 12A, Tarabya Mahallesi Sariyer, 34457, Istanbul, Turkey Mobile: + (90) (532) 426 21 87 -------------------------------------------------------- On 17.06.2019 12:04, "colorsync-users on behalf of Malcolm Mackenzie via colorsync-users" <colorsync-users-bounces+rtelhan=icloud.com@lists.apple.com on behalf of colorsync-users@lists.apple.com> wrote: Re; 1. ISO-3664:2009 illumination (graxx@videotron.ca) Hello Roger Just to add, if the luminaire uses a glass or plastic cover you have to check if it is effectively UV filtering. Most old and many modern ones are. Below is a GTI reading, no glass which is 3664:2009 compliant. [image: GTI.png] regards Malcolm Mackenzie Colour Engine _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/rtelhan%40icloud.com This email sent to rtelhan@icloud.com