RE: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
RE: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- Subject: RE: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort 2.0
- From: Roger Breton <email@hidden>
- Date: Fri, 21 Jan 2011 23:26:35 -0500
But according to the graph, there is still some light energy below 400nm?
Thank's for the clarification, Graeme.
Best / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden
[mailto:colorsync-users-bounces+graxx=email@hidden] On
Behalf Of Graeme Gill
Sent: January-21-11 10:55 PM
To: ColorSync
Subject: Re: Measuring "standard IT8.7/4 Random" on iSisXL using ColorPort
2.0
Roger Breton wrote:
> Thank's again for this follow-up reply but, correct me if I'm wrong,
> how can the white LED provide "UV-cut" measurements : because the
> illumination only cover part of the visible spectrum, does not reach into
the UV?
Yes. Standard white LED's are actually a blue LED with phosphor to cover the
longer wavelengths. LED's typically have a quite narrow bandwidth, so the
cut-off from blue to UV is quite sharp.
<http://ledmuseum.candlepower.us/ninth/l1d1.gif>
Graeme Gill.
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