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RE: C50 vs. Vita lites vs. Colortone's

On Thu, 10 Feb 2000 Ivo Busko wrote:
> "Ashcraft, Bob" <BAshcraft at medrad_com> wrote:
> <snip>
> > I also have Chroma 50's and Phillips Colortone 50's side by 
> side and the
> > Chroma's look gray compared to the Colortone's.  The 
> Colortone's seem to
> > retain their intensity for a longer period of time too.  

Ivo Busko wrote: 
> The spectral plots I have for the Chroma 50 and the Colortone 50 are
> identical. The difference you see is likely due to a difference in 
> brightness only. Maybe tubes with different ages ? The color 
> and brightness 
> responses of the human eye are somewhat interdependent.
> - -Ivo Busko
>  Baltimore, MD

I'm sure it is a difference in brightness that I'm noticing.  Both bulbs are
the same age, about 8 months, but like I said before, the Chroma's seem to
expire long before the Colortone's.

Bob Ashcraft
Pittsburgh, PA