Well then Roger ... I guess that's the end of the debate? Somehow I don't think you're entirely convinced :). Robert -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Roger Breton Sent: 08 July 2014 13:12 To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Custom Illuminant Robert, Many moons ago, Bruce Lindbloom demonstrated mathematically that g2.2 was better than 1.8 for everything. / Roger