On Sep 22, 2015, at 4:11 PM, Roger Breton <graxx@videotron.ca> wrote:
Where do you get reliable 5nm data for measuring light sources from? To plug into ISO-3664 computations?
First, I'm not doing any ISO or similar standards work. I use an i1 Pro for almost everything. My spectral camera model is at 5nm resolution...I started with 3nm but it got unwieldy and all the ICC data is at 5nm, and I haven't yet found any problems with 5nm. I've got a Perl script that converts the i1 Pro 3nm values to 5nm by averaging the inner 3nm values. Considering the 1i Pro has an optical resolution of 10nm, I don't feel like I'm losing anything. It might not be true 5nm going into the model, but it's more than 10nm. If I discover a need for more than ~5nm resolution, I'll do it with a camera an an homemade spectroscope. The spikiest light source I use for anything critical is is a PCB Einstein. I don't think I'd ever select any sort of fluorescent for critical work unless there simply wasn't any other option...the Einsteins are really good, and incandescents are also really good. I'd go with dim incandescents and multiple merged (median) exposures if necessary for noise before fluorescents. b&