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#184704 - 02/18/09 10:01 PM Measuring Light  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
A recent job made me wonder ...

First, I do have a use for a light meter, to measure overall lighting levels. No problem there; sources are many.

However ... is there any reasonably portable, and affordable, way to measure the color temperature of the existing lights?

I ask this, having just gone through a great deal of frustration on a job ... apart from the issue of removing a bulb for examination, it seems that many bulbs are not identified as to their color temp - making matching a challenge.


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#184707 - 02/18/09 10:31 PM Re: Measuring Light [Re: renosteinke]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,872
Brick, NJ USA
Hmmm. I gave a quick check of GELighting.com; no mention of anything to measure color temp, just an explanation.

I can't remember ever seeing any type of meter to do that. All I have ever used (and thought of) was a basic light meter.

I have a BEHA, small handheld analog, that's OK. For serious work a BEHA digital 93-1065F. Both are 'old' and have served me well. I still have both.



John

#184710 - 02/18/09 11:27 PM Re: Measuring Light [Re: HotLine1]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
John,
Photographers use colour temperature meters, if that is any help.


#184711 - 02/19/09 12:05 AM Re: Measuring Light [Re: Trumpy]  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
Thanks for the hint, Mike .... alas, those things are selling for over a thousand dollars! Not quite my idea of 'affordable.'


#184713 - 02/19/09 01:29 AM Re: Measuring Light [Re: renosteinke]  
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 790
Chicago, Il.
I haven't really considered color temperatures since my broadcasting and post-production days. There, you really want all your monitors setup the same way. If you already have to buy a light meter, you might be able to determine color temperature using filters: 1st reading, no filter. 2nd reading, red filter. 3rd reading, blue filter. I think that the transmissivities would shift from red towards blue with increasing color temperature. I don't know if there are convenient charts out there for specific density filters or not. You could probably check light sources of known color temperature, note the percentages, and develope your own reference.
Joe


#184716 - 02/19/09 02:06 AM Re: Measuring Light [Re: JoeTestingEngr]  
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
John., here one item i will post it for now and when I find more items I will add to the list here


Here the first one .,, colour temp chart

Merci,Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


#184719 - 02/19/09 03:47 AM Re: Measuring Light [Re: renosteinke]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
John,
One thing that is hardly ever touched upon, is the CRI (Colour Rendering Index) of a light source.
At the worst end of the scale is light sources like Sodium (low and high pressure) up to lamps like Metal-Halide and tri-phosphour(sp?) fluorescent tubes.
I think a few years back I wanted a discussion on this very subject, but it died, lighting has come a long way over the last couple of years, more lumens/watt and with a better choice of colours.


#184722 - 02/19/09 09:53 AM Re: Measuring Light [Re: renosteinke]  
SteveFehr  Offline
Member
Joined: Mar 2005
Posts: 1,213
Chesapeake, VA
I wonder... a lot of digital cameras these days feature histograms and automatic white balance. Do any have a built-in color temperature reading? Maybe you just need a new camera!


#184724 - 02/19/09 11:39 AM Re: Measuring Light [Re: SteveFehr]  
ghost307  Offline
Member
Joined: May 2005
Posts: 915
Chicago Illinois USA
That brings back memories of the "dumbest smart person" I ever met.

We were designing a workshop in a large office complex and the directive from the guys who would be working in that shop was to use 4100 degree fluorescent lighting in 1 particular room.
The Architette (AKA Ms. Architect) asked if we needed to increase the HVAC in that room if the lights were going to be that hot.

smile smile smile


Ghost307

#184731 - 02/19/09 03:45 PM Re: Measuring Light [Re: ghost307]  
Retired_Helper  Offline
Member
Joined: Mar 2007
Posts: 165
Maine
Originally Posted by ghost307
That brings back memories of the "dumbest smart person" I ever met.

We were designing a workshop in a large office complex and the directive from the guys who would be working in that shop was to use 4100 degree fluorescent lighting in 1 particular room.
The Architette (AKA Ms. Architect) asked if we needed to increase the HVAC in that room if the lights were going to be that hot.

smile smile smile


By any chance a RISD grad? wink


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