Hello Roger Yes the paper should appear bluer with the higher levels of UV. You can buy some Plastic UV filtering sheet easily and hold it over the print to, sort of, have a comparison of UV /non UV illuminant which can be useful when explaining the difference to clients. https://www.cutplasticsheeting.co.uk/clear-acrylic-sheeting/anti-reflective-... regards Malcolm Mackenzie On Tue, 18 Jun 2019 at 04:14, <graxx@videotron.ca> wrote:
Thank you, Malcom.
You're right, the whole thing needs to be assessed, not just the tubes.
I superimposed the spectrum image you sent with the one from my humble Excel sheet (tried to aligned them at 560nm) and it is clear that the new tubes have more energy around 360nm.
https://1drv.ms/u/s!AkD78CVR1NBqkLUuwGMsH5ObGTay4A
I still wonder what the visual difference is like, the same print viewed in two light booths, one with the old lamp and one with the new, E tubes? If the substrate incorporates a lot of OB, like b* = -6.00, the booth with the new lamps should make all color appear "bluer" overall, right?
/ Roger