Dear Roger, I haven't test it yet. But The GL Optic seems to be more versatile because it offers a lot of accessories for various measure like light values, lumens value, luminance for display, LED, fluorescent. All the best from Paris, Axel De : Roger Breton <graxx@videotron.ca<mailto:graxx@videotron.ca>> À : Axel ROBERT <axel.robert@ubisoft.com<mailto:axel.robert@ubisoft.com>>, "colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com>" <colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com>> Cc : "colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com>" <colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com>> Objet : RE: Colorsync-users Digest, Vol 9, Issue 67 Thank you Axel. I heard of the GL Optic miniature spectrometer through JUST-Normlicht's Eric Dalton. What do you think of the Minolta CL-500A, since you're on the subject? Comparable specs? Overkill? Underkill? Best / Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com<mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com> [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Axel Robert Sent: April-27-12 4:39 PM To: colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com> Cc: colorsync-users@lists.apple.com<mailto:colorsync-users@lists.apple.com> Subject: Re: Colorsync-users Digest, Vol 9, Issue 67 Dear all, there is currently only one tool which is able to measure the light environment and in the same time is conform with the ISO 3664. It is a spectroradiometer especially developped to do it well. Why? Actually the fact is that the EyeOne Pro only does measure at sampling interval: 3.5nm. It is to far for good results. Instead of this, these tool is able to reproduce and analyze wavelength each +/- 0.5 nm according to the ISO 3664 who needs to be < 1.0 for Mvis and < 1.5 for Muv. Thus, the EyeOne Pro displays results which appear exact but in fact are not. It is called GL optic. Axel Robert