Re: Light bulbs
Re: Light bulbs
- Subject: Re: Light bulbs
- From: Graeme Gill <email@hidden>
- Date: Fri, 19 Jan 2007 13:47:21 +1100
Rick wrote:
> I recently purchased new bulbs for our 3 light booths as well as for the booths that are press side. (40 bulbs in all) After installing all of them I realized that our GATF/RHEM indicator looks like a zebra under them.(It did not show any stripes at all on the previous bulbs from Normlicht...
but they had been in for over 2500 hours so they were due to be changed) I ordered these from a local lighting company and they were quite economical compared to the ones from Normlicht. They are made by Sylvania and say 5000k on the bulb.
There can be a huge difference between a D50 white point, and a D50
spectrum. There have been attempts to quantify this difference
into a single number ("rendering index"), although it's a pretty
rough guide. The U.V. content of most illuminants is pretty
uncontrolled too.
> (Exact product is FO32/750/eco) I
> took my trusted eye one to the booth and took a ambient reading and it reads around 4830k or so and my CRI index in Eye one share is a paltry 76. I am also surprised by how mountainous the spectral analysis is. Are there any options other than spending the big bucks at Normlicht or Macbeth?
Thanks in advance for any advice.
It's technically hard to produce an artificial light source that in any
way resembles D50 spectrum. You therefore have to pay for it, or pay
the price in some other way (poor correspondence with the standard lighting
condition).
Graeme Gill.
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