Permission to scream, sir?

Looking for some lamps (CFL and/or LED) and, not wanting Warm
White/2700K, nor Daylight, I have been searching with other obvious terms.

Have found that sometimes Cool White means 3000K. Sometimes 4200K, or
5000K, or 6000K or 6500K. Or some other in-between temperature. Seems to
start at 2701K and go to infinity!

I had hoped that 6000/6500K might commonly be "Daylight", 2700K "Warm
White" and maybe 3500 to 5000K could be "Cool White" - but no chance.

And does anyone list CRI in the lamp specifications? Other than a few
fluorescents, hardly ever.

--
Rod

In article ,
polygonum wrote:
Permission to scream, sir?

Looking for some lamps (CFL and/or LED) and, not wanting Warm
White/2700K, nor Daylight, I have been searching with other obvious terms.

Have found that sometimes Cool White means 3000K. Sometimes 4200K, or
5000K, or 6000K or 6500K. Or some other in-between temperature. Seems to
start at 2701K and go to infinity!

I had hoped that 6000/6500K might commonly be "Daylight", 2700K "Warm
White" and maybe 3500 to 5000K could be "Cool White" - but no chance.

And does anyone list CRI in the lamp specifications? Other than a few
fluorescents, hardly ever.

It tells you more with a tungsten lamp which has a fairly continuous
spectrum output (as does a decent tri-phosphor florry) than with CFL and
LED which are anything but.

--
*Never slap a man who's chewing tobacco *

Dave Plowman London SW
To e-mail, change noise into sound.

On Saturday, November 17, 2012 10:36:37 AM UTC, polygonum wrote:

Permission to scream, sir?
Looking for some lamps (CFL and/or LED) and, not wanting Warm
White/2700K, nor Daylight, I have been searching with other obvious terms.
Have found that sometimes Cool White means 3000K. Sometimes 4200K, or
5000K, or 6000K or 6500K. Or some other in-between temperature. Seems to
start at 2701K and go to infinity!
I had hoped that 6000/6500K might commonly be "Daylight", 2700K "Warm
White" and maybe 3500 to 5000K could be "Cool White" - but no chance.

And does anyone list CRI in the lamp specifications? Other than a few
fluorescents, hardly ever.

Fl tubes normally do. CFLs I've seen it in small print on the box, sometimes in a format like '827' meaning 80-90% CRI 2700K CCT.


NT

On 17/11/2012 12:29, wrote:
On Saturday, November 17, 2012 10:36:37 AM UTC, polygonum wrote:

Permission to scream, sir?
Looking for some lamps (CFL and/or LED) and, not wanting Warm
White/2700K, nor Daylight, I have been searching with other obvious terms.
Have found that sometimes Cool White means 3000K. Sometimes 4200K, or
5000K, or 6000K or 6500K. Or some other in-between temperature. Seems to
start at 2701K and go to infinity!
I had hoped that 6000/6500K might commonly be "Daylight", 2700K "Warm
White" and maybe 3500 to 5000K could be "Cool White" - but no chance.

And does anyone list CRI in the lamp specifications? Other than a few
fluorescents, hardly ever.

Fl tubes normally do. CFLs I've seen it in small print on the box, sometimes in a format like '827' meaning 80-90% CRI 2700K CCT.


NT

Yes - seen that. But often not listed on-line, unfortunately.

--
Rod

On Sat, 17 Nov 2012 10:36:34 +0000, polygonum
wrote:

And does anyone list CRI in the lamp specifications? Other than a few
fluorescents, hardly ever.

http://www.lampspecs.co.uk/Light-Bul...-Son-White-Son

Discharge lamps often do, as it's quite important.
GE Sylvania did, the last time I looked.


Fluorescents...
Knock yourself out.
http://www.lampspecs.co.uk/Light-Bul...865-Daylight_4

On 17/11/2012 17:52, Grimly Curmudgeon wrote:
On Sat, 17 Nov 2012 10:36:34 +0000, polygonum
wrote:

And does anyone list CRI in the lamp specifications? Other than a few
fluorescents, hardly ever.

http://www.lampspecs.co.uk/Light-Bul...-Son-White-Son

Discharge lamps often do, as it's quite important.
GE Sylvania did, the last time I looked.


Fluorescents...
Knock yourself out.
http://www.lampspecs.co.uk/Light-Bul...865-Daylight_4

They do indeed put a lot of detail out! Thanks.

--
Rod

On Saturday, November 17, 2012 5:52:45 PM UTC, Grimly Curmudgeon wrote:


http://www.lampspecs.co.uk/Light-Bul...-Son-White-Son

What's the point of a 35w 1300 lumen 6000hr slow warmup white sodium lamp for £50? A CFL has better efficacy, faster warmup, longer life, instant onoffability and a fraction the price.


NT

wrote:
On Saturday, November 17, 2012 5:52:45 PM UTC, Grimly Curmudgeon wrote:


http://www.lampspecs.co.uk/Light-Bul...-Son-White-Son

What's the point of a 35w 1300 lumen 6000hr slow warmup white sodium lamp for £50? A CFL has better efficacy, faster warmup, longer life, instant onoffability and a fraction the price.


If you need it, the 83% CRI makes it worth the effort and money. If you
don't need it, then a CFL will indeed do the job.

--
Tciao for Now!

John.

On Saturday, November 17, 2012 10:13:04 PM UTC, John Williamson wrote:
meow2222 wrote:
On Saturday, November 17, 2012 5:52:45 PM UTC, Grimly Curmudgeon wrote:


http://www.lampspecs.co.uk/Light-Bul...-Son-White-Son

What's the point of a 35w 1300 lumen 6000hr slow warmup white sodium lamp for £50? A CFL has better efficacy, faster warmup, longer life, instant onoffability and a fraction the price.

If you need it, the 83% CRI makes it worth the effort and money. If you
don't need it, then a CFL will indeed do the job.

CFLs are normally in the 80s% CRI.


NT

On Sun, 18 Nov 2012 03:30:49 -0800 (PST), wrote:


What's the point of a 35w 1300 lumen 6000hr slow warmup white sodium lamp for £50? A CFL has better efficacy, faster warmup, longer life, instant onoffability and a fraction the price.

If you need it, the 83% CRI makes it worth the effort and money. If you
don't need it, then a CFL will indeed do the job.

CFLs are normally in the 80s% CRI.

Shop lighting designers are a different breed to anyone else and would
get all precious if they couldn't get what they wanted.
Also, there's an installed base of these things so notwithstanding the
suitability or otherwise of the horrible CFL ****e, it's necessary to
replace like with like as what shopowner wants to rip all the fitting
down to put some utter ****e lighting in?