| Author |
Info wanted on "cool white / soft white"
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| sparky 2005-12-18, 5:21 pm |
| I am looking for a web site that I saw a year ago on why it is better
to have soft white lighting in a work environment. This is for a
Aerospace company that has offices and production in the workplace. My
seach has been poor so I am here begging........
Thanx !
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"sparky" <astraea41@aol.com> wrote in message
news:1134937583.895558.269570@g44g2000cwa.googlegroups.com...
> I am looking for a web site that I saw a year ago on why it is better
> to have soft white lighting in a work environment. This is for a
> Aerospace company that has offices and production in the workplace. My
> seach has been poor so I am here begging........
>
> Thanx !
cool white lamps are the standard of corporate America. Warm white is a
close second.
Your google broken again?
http://www.bulbs.com/default.asp?pa...ducts&class=669
convert the names to a "color number"
I did a change out at a university from cool whites to warm whites, along
with ballast and lighting sensor install. Biggest problem we had was the
color difference between areas and lamp types, any of the HID lamps were a
problem.
Getting your "factory" to convert the lighting will be an uphill struggle.
When I did my change out I had government money on my side and management
wanted to suck up as much as I could spend. With out the FEDS money the
project would have never been done.
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| meow2222@care2.com 2005-12-19, 1:21 am |
| SQLit wrote:
> "sparky" <astraea41@aol.com> wrote in message
> news:1134937583.895558.269570@g44g2000cwa.googlegroups.com...
warm white is in the region of 2700-3000k, cool white is around 4500k.
Cool white is somewhat unpleasant, and better avoided. Its only
advantage is that the old halophosphate cool white tubes had a bit
higher efficacy than warmer whites, hence their use in locations where
appearance didnt matter in the least, eg factories. 3500K is probably
one of the better colour temps of the halophosphate tube types.
[color=darkred]
> Getting your "factory" to convert the lighting will be an uphill struggle.
> When I did my change out I had government money on my side and management
> wanted to suck up as much as I could spend. With out the FEDS money the
> project would have never been done.
I dont understand that. The usual plan is simply to buy white instead
of cool white, and fit those tubes as and when old tubes die, as usual.
This works well in multi-tube fittings, where the differing whites get
blended. It also works with single tube fittings, though does make the
tubes look ill matched during the changeover time.
NT
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| meow2222@care2.com wrote:
<snip>
> warm white is in the region of 2700-3000k, cool white is around 4500k.
<snip>
It's pretty funny that cool is hotter than warm. I assume that's
because "warm" is more like candle-light, with its "warmth."
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| daestrom 2005-12-19, 5:21 pm |
|
"CJT" <abujlehc@prodigy.net> wrote in message
news:43A66E0A.6040905@prodigy.net...
> meow2222@care2.com wrote:
>
> <snip>
> <snip>
>
> It's pretty funny that cool is hotter than warm. I assume that's
> because "warm" is more like candle-light, with its "warmth."
>
Yeah, the 'cool' white has more of a blue tinge to it. Marketing hype
suggests folks think of 'cool' as in ice when they see blue, while
yellow/red suggests 'hot'. Incandescents give out a 'warm' light because
they run cooler and have more red/yellow light than blue. What a world.
daestrom
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| RF Dude 2005-12-19, 7:21 pm |
| I looked at the light from some CF lamps that were 2900K and their light
looked the same as from a good incandescent bulb. In short, I like it for
around the home.
Trouble is that a lot of consumer product no longer lists the colour
temperature on the bulb or packaging. And they have been using various
"word" descriptors rather than a colour temperature. For instance, cool
white has also been called daylight white or "pure" white. So when I get
stuck with a 5000k bulb, I've put it into the closet... If I need to assess
a colour strip with this "pure" light, I go into the closet. Helps
separating the dark blue pants from the black ones too. ;-})
RF Dude
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| Harry Chickpea 2005-12-19, 7:21 pm |
| "RF Dude" <post@thisnewsgroup.com> wrote:
>I looked at the light from some CF lamps that were 2900K and their light
>looked the same as from a good incandescent bulb. In short, I like it for
>around the home.
>
>Trouble is that a lot of consumer product no longer lists the colour
>temperature on the bulb or packaging. And they have been using various
>"word" descriptors rather than a colour temperature. For instance, cool
>white has also been called daylight white or "pure" white. So when I get
>stuck with a 5000k bulb, I've put it into the closet... If I need to assess
>a colour strip with this "pure" light, I go into the closet. Helps
>separating the dark blue pants from the black ones too. ;-})
>
>RF Dude
>
This is a good thing.
Some (most, in fact) of the CFs are spikey in their spectrums. While
the overall effect might be close to a certain color temperature, it
bears little or no relationship to a true blackbody color temp. The
fun way to discover this is to color balance an inkjet print under a
CF and then take it out in the sunlight and see the changes. The dyes
in the inkjet ink are also very spectrally specific, and the spikes
may or may not match with the spike output of the CF.
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| SolarFlare 2005-12-19, 9:21 pm |
| Cool white is not called "daylight". Daylight
flourescents are over 5600K and cost much more.
I like the SP 65 bulbs. Thye run 6500K and look quite
purple for the first few days then mellow out but put
out good clear light capable of determining most
colours without error. Geat work light.
"RF Dude" <post@thisnewsgroup.com> wrote in message
news:qqGpf.958$%N1.168508@news20.bellglobal.com...
> Trouble is that a lot of consumer product no longer
lists the colour
> temperature on the bulb or packaging. And they have
been using various
> "word" descriptors rather than a colour temperature.
For instance, cool
> white has also been called daylight white or "pure"
white. So when I get
> stuck with a 5000k bulb, I've put it into the
closet... If I need to assess
> a colour strip with this "pure" light, I go into the
closet. Helps
> separating the dark blue pants from the black ones
too. ;-})
>
> RF Dude
>
>
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|
| SolarFlare wrote:
> Cool white is not called "daylight". Daylight
> flourescents are over 5600K and cost much more.
>
> I like the SP 65 bulbs. Thye run 6500K and look quite
> purple for the first few days then mellow out but put
> out good clear light capable of determining most
> colours without error. Geat work light.
I haven't had to work on a Geat in years.
:-)
>
>
> "RF Dude" <post@thisnewsgroup.com> wrote in message
> news:qqGpf.958$%N1.168508@news20.bellglobal.com...
>
>
> lists the colour
>
>
> been using various
>
>
> For instance, cool
>
>
> white. So when I get
>
>
> closet... If I need to assess
>
>
> closet. Helps
>
>
> too. ;-})
>
>
>
>
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The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.
| |
| PanHandler 2005-12-20, 12:21 pm |
|
"RF Dude" <post@thisnewsgroup.com> wrote in message
news:qqGpf.958$%N1.168508@news20.bellglobal.com...
>I looked at the light from some CF lamps that were 2900K and their light
>looked the same as from a good incandescent bulb. In short, I like it for
>around the home.
>
> Trouble is that a lot of consumer product no longer lists the colour
> temperature on the bulb or packaging. And they have been using various
> "word" descriptors rather than a colour temperature. For instance, cool
> white has also been called daylight white or "pure" white. So when I get
> stuck with a 5000k bulb, I've put it into the closet... If I need to
> assess a colour strip with this "pure" light, I go into the closet. Helps
> separating the dark blue pants from the black ones too. ;-})
I went to a well regarded fabric store last week to buy some vinyl for my
bar stools. The area (learned this on return trip) where the vinyl rolls
were displayed was illuminated by a mix of cool and warm tubes. I got home
and my S/O asked why I got blue instead of black. Really pissed me off - a
60 mile round trip because of some jerk's incompetence. To top it off, they
wanted to charge a restocking fee for cut goods. They had to call in the
manager to calm me down. He was the only one that had a clue about color
temps.
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| SolarFlare 2005-12-20, 8:21 pm |
| I heard you haven't worked at all for years.
LOL
"CJT" <abujlehc@prodigy.net> wrote in message
news:43A76251.3060600@prodigy.net...
> SolarFlare wrote:
>
quite[color=darkred]
put[color=darkred]
>
> I haven't had to work on a Geat in years.
>
>
>
>
>
> :-)
>
have[color=darkred]
temperature.[color=darkred]
the[color=darkred]
>
>
> --
> The e-mail address in our reply-to line is reversed
in an attempt to
> minimize spam. Our true address is of the form
che...@prodigy.net.
| |
|
| SolarFlare wrote:
> I heard you haven't worked at all for years.
>
> LOL
If you actually heard that (which I doubt) then you heard wrong.
:-)
> "CJT" <abujlehc@prodigy.net> wrote in message
> news:43A76251.3060600@prodigy.net...
>
>
> quite
>
>
> put
>
>
> have
>
>
> temperature.
>
>
> the
>
>
> in an attempt to
>
>
> che...@prodigy.net.
>
>
--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.
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