The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Correct rotation, wrong sequence
by Potseal
Today at 03:14 PM
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 12
HotLine1 10
Potseal 9
sparkyinak 8
Texas_Ranger 7
Who's Online
0 registered (), 198 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#184704 - 02/18/09 06:01 PM Measuring Light
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: 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.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#184707 - 02/18/09 06:31 PM Re: Measuring Light [Re: renosteinke]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6805
Loc: 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

Top
#184710 - 02/18/09 07:27 PM Re: Measuring Light [Re: HotLine1]
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
John,
Photographers use colour temperature meters, if that is any help.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#184711 - 02/18/09 08:05 PM Re: Measuring Light [Re: Trumpy]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Thanks for the hint, Mike .... alas, those things are selling for over a thousand dollars! Not quite my idea of 'affordable.'

Top
#184713 - 02/18/09 09:29 PM Re: Measuring Light [Re: renosteinke]
JoeTestingEngr Offline
Member

Registered: 11/04/05
Posts: 786
Loc: 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

Top
#184716 - 02/18/09 10:06 PM Re: Measuring Light [Re: JoeTestingEngr]
frenchelectrican Offline

Member

Registered: 02/06/03
Posts: 938
Loc: 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?)


Top
#184719 - 02/18/09 11:47 PM Re: Measuring Light [Re: renosteinke]
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: 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.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

Top
#184722 - 02/19/09 05:53 AM Re: Measuring Light [Re: renosteinke]
SteveFehr Offline
Member

Registered: 03/19/05
Posts: 1192
Loc: 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!

Top
#184724 - 02/19/09 07:39 AM Re: Measuring Light [Re: SteveFehr]
ghost307 Offline
Member

Registered: 05/09/05
Posts: 884
Loc: 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

Top
#184731 - 02/19/09 11:45 AM Re: Measuring Light [Re: ghost307]
Retired_Helper Offline
Member

Registered: 03/13/07
Posts: 167
Loc: 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

Top
Page 1 of 2 1 2 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals