Re: "Full-spectrum" article on Wikipedia


"Ioannis" <morpheus@xxxxxxxxxxxx> wrote in message
news:1180884376.753433@xxxxxxxxxxx
"Alex" <no@xxxxxxxxxxxx> wrote in message
news:Xns994496CA6395571F3M4@xxxxxxxxxxxx
[snip]

As a non-lighting engineer, may I ask a simple question in this
thread.

If a lamp is rated at a certain colour temperature then how is its
colour temperature determined from its spectrograph?

A spectrograph of a lamp's emissions seems to show there is a large
and complex number of peaks & troughs sometimes they are in bands
across its spectrum. This seems a tricky starting point.

What analysis is used to create a single colout temperature value
from the spectrum?

This page addresses your question:
http://ioannis.virtualcomposer2000.com/spectroscope/elements.html

Look at sections: The Mathematics of Color (and the corresponding
reference links which point at the algorithms which caluclate the CCT)
The Planckian Locus and Lamp Engineering.
--
I.N. Galidakis --- http://ioannis.virtualcomposer2000.com/
----------------------------------------------------------
"There's ALWAYS a mistake somewhere"

The Lighting Research Center has updated their original 2003 publication on
"full-spectrum" lighting to include a definition based upon an equal-energy
source and they have an interesting way to calculate what they call a
"full-spectrum metric".

Sorry, I should have looked at this report earlier and passed the reference
along.

See:
http://www.lrc.rpi.edu/programs/nlpip/publicationdetails.asp?ID=887&type=2

Terry McGowan


.

Relevant Pages

  • Re: "Full-spectrum" article on Wikipedia
    ... If a lamp is rated at a certain colour temperature then how is ... its colour temperature determined from its spectrograph? ... reference links which point at the algorithms which caluclate the ... CCT) The Planckian Locus and Lamp Engineering. ...
    (sci.engr.lighting)
  • Re: "Full-spectrum" article on Wikipedia
    ... May I therefore suggest that we work on a draft here in s.e.l., ... I don't want to do it myself because I am not a lighting engineer, ... If a lamp is rated at a certain colour temperature then how is its ... A spectrograph of a lamp's emissions seems to show there is a large ...
    (sci.engr.lighting)
  • Re: "Full-spectrum" article on Wikipedia
    ... If a lamp is rated at a certain colour temperature then how is its ... A spectrograph of a lamp's emissions seems to show there is a large ... The Planckian Locus and Lamp Engineering. ...
    (sci.engr.lighting)