On 08/06/2012 06:44 PM, pixl Aps wrote:
I've been doing a fair bit of measuring of lightubes (I can recommend Babelcolor CT&A and an Eye One pro for this - even though strictly the Spectral resolution of the eye one isn't enough to comply with 3664). If you want Phillips tubes you want Master TL-D 90 Graphica and these do work well in graphical arts environments - provided your casing doesn't change the color of the light. I've linked to a report on a newly installed set of these tubes at a customer site for those interested below.
Phillips_TLD90_Graphica.pdf (http://db.tt/Wx6Pu7YL)
Thomas Holm
Not with the intention to use LED lamps for that kind of critical applications but where do the TLD90 Graphica CRI 93 lack in color fidelity compared to the following LED lamp with CRI 92 ? http://www.olino.org/us/articles/2012/02/01/lemnis-lighting-asia-pharox-asia... The last still does not score good at the Red R9 and Blue R12 patches of that test though already much better than many other LED lamps. I have seen spectral plots of the Philips FL lamps but nothing like the measurements that olino.org does to get a good base for comparing. Replacing FL tubes with LED tubes is in my opinion not a good decision as the first will still be more economic considering purchase, running costs and lumen/watt ratio. The more with high CRI products. I doubt there will be better environmental aspects in either one. Mercury + fluorescents in FL versus the complexity of the LED tube designs, their production and the recycling of the parts later on. It is different for point light sources where a high CRI number is needed, replacing halogens, tungsten and CFLs with LED designs should be possible in time. -- Met vriendelijke groet, Ernst Dinkla Grafische Techniek Quad, piëzografie, giclée www.pigment-print.com