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: Graeme Gill <email@hidden>
- Date: Sun, 14 Oct 2007 15:20:48 +1000
Marco Ugolini wrote:
White LED = http://en.wikipedia.org/wiki/Image:White_LED.png
Mmm.... There's also this other LED spectral graph on Wikipedia:
<http://tinyurl.com/3cqwcs>
Yes, there are two common ways of making white LEDs. The former
uses a blue LED and some phosphor type material. Note that like
other phosphor type light sources, it will age, although calibration
will compensate. The more expensive way uses R,G & B LEDs.
In theory one could create a fairly uniform white spectrum by
choosing half a dozen or so different wavelength LEDs from Infra-red
to Ultra-Violet, and mixing the light together. It would have a few
ripples, but you could even have different settings (by changing
the drive to each LED) to emulate different viewing illuminant
spectra, ie. D65, D50, incandescent etc., thereby getting better
matching with FWA impregnated substrate.
[There you go - an obvious idea to an ordinary practitioner, therefore
not patentable after this point in time!]
Looks very smooth. In other words, it all sounds quite contradictory still:
if pulsed-Xenon is supposed to be smooth and LED spiky, that is not
supported by what I am seeing so far.
In overall shape you're right, by my impression was that Xenon is rather
spiky when you look at the detail, whereas LED is somewhat smother.
The overall shape has the biggest effect on FWA influence though.
Graeme Gill.
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