Re: Request for spectral data of light sources
Re: Request for spectral data of light sources
- Subject: Re: Request for spectral data of light sources
- From: Marco Ugolini <email@hidden>
- Date: Sun, 14 Oct 2007 13:54:16 -0700
- Thread-topic: Request for spectral data of light sources
In a message dated 10/14/07 6:54 AM, Roger Breton wrote:
>> if pulsed-Xenon is supposed to be smooth and LED spiky, ...
>> Marco Ugolini
>
> My point for Xenon, Marco, is not that it is a smooth function but that it
> throws a lot more UV energy onto the specimen when measuring reflectance
> then a tungsten source can. Thereby exciting more fluorescence and, in the
> opinion of many color scientists, correlating better with our visual
> assessments when the specimen is viewed under real daylight sources.
Point taken. I agree with you.
> But I don't know much about the arrangement of the LEDs inside the iSis.
> I gather it uses a single UV-LED and a single white LED. No one knows at
> which wavelengths this UV LED is illuminating. And no one knows the SPD
> of the white LED. As users, X-rite will say that whathever arrangements
> they chose in their design should be "transparent" to us, as long as
> readings are comparable to those obtainable with other instruments.
> But we are a curious bunch and, personnally, I'd like to know exactly
> what's going on inside this instrument before I give X-rite my hard-earned
> dollar for an iSis.
Yes, as much as I see the gains (increased stability, ready access without
need for warming up, etc.) to be had by using LEDs instead of other light
sources, I would also like some reassurance, like you do, that the spectral
distribution of the LED light sources is at the very least least comparable,
or even superior, to that of the ones it replaces.
Marco Ugolini
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