On Tue, 21 Mar 2006 08:54:55 GMT, "." wrote:

|Dave Fawthrop wrote:
| On Tue, 21 Mar 2006 07:49:22 GMT, "." wrote:
|
| Dave Fawthrop wrote:
| On Mon, 20 Mar 2006 19:35:26 GMT, "." wrote:
|
| Dave Fawthrop wrote:
| On Mon, 20 Mar 2006 18:31:18 GMT, "." wrote:
|
| Dave Fawthrop wrote:
|
| White LEDs are very *white*
|
| Which is what *I* see.
|
| IME they are very /blue/
|
| snip
|
| What you are seeing is the *difference* between the light sources.
|
| what I'm seeing is different wavelengths given out by those
| lightsources
|
| very blue, very cold.
|
| Colour is a very personal thing
|
| it's totally impersonal, measured in Kelvin's.
|
| Kelvins are a *temperature* scale.
| http://www.windows.ucar.edu/earth/At...re/kelvin.html
|
| oh, dear, poor dave :-(
|
| http://en.wikipedia.org/wiki/Color_temperature
|
| Colour temperature is totally inappropriate for measuring the
| wavelengths light from LEDs. What colour temperature is a green LED?
|
|I don't care ! but here's some reading matter for /you/ ;-)
|
|http://www.helios32.com/LEDOctMODELING21-23_Reprint.pdf

Thanks, it demonstrated my point perfectly.
--
Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst*
method of accessing usenet. GG subscribers would be well advised get a
newsreader, say Agent, and a newsserver, say news.individual.net. These
will allow them: to see only *new* posts, a killfile, and other goodies.