Re: GE Reveal neodymium bulbs
Re: GE Reveal neodymium bulbs
- Subject: Re: GE Reveal neodymium bulbs
- From: <email@hidden>
- Date: Mon, 04 Nov 2002 08:10:26 -0800
on 11/4/02 5:45 AM, michael shaffer at email@hidden wrote:
>
L Asselstine writes ...
>
>
> I got an email from someone who is all enthusastic about the new GE
>
> Reveal neodymium bulbs as a possible light source for evaluating prints-
>
> does anybody on this list have any information about them? ...
>
>
My investigations revealed that neodymium doped glass absorbs wavelengths
>
such that the resulting composition of the spectrum is near natural
>
daylight. A visualization of the spectrum shows a gap where the absorbtion
>
occurs, and my own opinion is that a hole in the spectrum is likely to have
>
the same metamyrismic effects as a spectrum with spikes. Not exactly the
>
same, mind you ... but still not similar to a true broad spectrum as is
>
natural daylight. But then ... who uses daylight to evaluate their prints
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anymore???
>
>
cheerios ... shAf :o)
>
Avalon Peninsula, Newfoundland
>
www.micro-investigations.com
I have seen these bulbs at lighting design center stores. I brought my color
meter with me to test the color temperature of these bulbs and was not
impressed. If I remember correctly, the Kelvin reading was closer to
tungsten than daylight. After getting a look at these bulbs I decided they
were not what I need for viewing prints. I choose instead to use 18" Chroma
50 fluorescent tubes. The marking on the tube are: GE F15T8 Chroma 50 15
watt. These bulbs were readily available at my local hardware store.
Steve Skoll
email@hidden
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