Re: Fluorescent heating

In article <h58jl4hlsdg1vu1iql0qeuji7lmiiias4c@xxxxxxx>, JosephKK wrote:
On Tue, 30 Dec 2008 00:40:36 +0000 (UTC), don@xxxxxxxxxxxxxx (Don
Klipstein) wrote:

In article <15ihl4tbud23b9v1t1hat5hnpr3u7rnlv6@xxxxxxx>, Ken wrote:
On Mon, 29 Dec 2008 01:25:55 -0800, JosephKK <quiettechblue@xxxxxxxxx>
wrote:

This is my favorite http://tekniken.se/misc/philips_tld36w-92.jpg
This tube is 20 years old now and still going strong.
I can't find any LED that have this light quality. 2700K CRI95


I challenge both the color temperature claim and the CRI claim,
and especially the combination. 2700 K would be rather
yellow-orange colored.

No. It's a very, very good combination.
This tube I use now is perfect colored and have high CRI.
http://tekniken.se/misc/philips_tld36w-92.jpg
http://tekniken.se/misc/philips_tld.png
I'm searching for LEDs with the same color and CRI.
Here in scandinavia we want warm light.


Standard incandescent are around 3200 K color temperature

Maybe some halogen lights is 3200K.

and do not have over 90 CRI.

Incandescent normally have high CRI, over 95.

100 - according to the definition of CRI, especially the most-usual
color rendering index, which is Ra8. Usual incandescents have CRI of 100
by definition.

- Don Klipstein (don@xxxxxxxxx)

Then something decidedly weird is part of the specification. How
could everything from heat lamps at about 1500 K color temperature to
ultra hot blue-white plant lamps at about 7500 K all have a CRI of
100? The spectra are nothing alike. Nor do the same objects
illuminated by these sources look the same. "What's up with that?"

CRI is by definition 100 for daylight/sunlight sources when color temp.
is higher than the incandescent range, and 100 for incandescent sources
when color temp. is in some sort of "tungsten incandescent" range. A wide
range of color temperatures has capability of achieving CRI of 100.

Other light sources are compared to either daylight/sunlight or
incandescent of same correlated color temperature. Deviation from
daylight/sunlight/incandescent (depending on correlated color temperature)
in rendering hue or saturation of any/all of 8 particular "Munsell colors"
detracts from a score of 100 in the "Ra8" CRI.

- Don Klipstein (don@xxxxxxxxx)
.

Relevant Pages

  • Re: Best Compact Fluorescents
    ... opinions about that. ... temperature and color rendering do vary from manufacturer. ... you should find the color temperature that you want in a ... CRI, use it. ...
    (sci.engr.lighting)
  • Re: Something new for CFL ceiling lighting?
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    (sci.engr.lighting)
  • Re: CFLs with warm tone?
    ... Just wondering if anyone has a particular recommendation for a CFL ... with a nice warm tone. ... Try looking for "warm white" for something a bit closer to incandescent. ... color temperature your eyes will adjust nicely. ...
    (alt.home.repair)
  • Re: Fluorescent heating
    ... I challenge both the color temperature claim and the CRI claim, ... This tube I use now is perfect colored and have high CRI. ... I'm searching for LEDs with the same color and CRI. ...
    (sci.electronics.design)
  • Re: Light Fair
    ... The only LED data I believe is the data published by the DOE ... IENSA methods get CRI data by compiling subjective ... is the relationship of color temperature and CRI. ... or use e-mail address listed at the Web site. ...
    (sci.engr.lighting)
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