What are inspectors using to detect the type of lighting found in residential applications? I need a meter to help detect CFL and LED lights so I don't have to get a ladder and remove shrouds.

Thanks.

Tags: CFL, light, lighting, meter, tools

Views: 73

Replies to This Discussion

If the question is "incandescent vs. compact fluorescent" OR "cfl vs. LED" -- then a diffraction grating will help. Go to a toy store and find the little cardboard glasses with plastic lenses that make every light bulb look like a rainbow.

See the attached handout. Incandescent lamps radiate across all visible wavelenghts, so in a diffraction grating you see a spectrum of colors all blended together. CFL's have 4, 5 or 6 phosphors blended together. The lamp makes light that we see as "white", but in fact each phosphor radiates at a very specific wavelength. Through a diffraction grating, you can see multiple images of the light source, each with the different color produced by that phosphor.

WHITE LEDs are doped to radiate across most of the visible spectrum. So a diffraction grating shows the same "smeared" continuous specturm as an incandescent bulb.

You can see this effect even if the lamp is in an enclosed luminaire -- the image of the luminaire will take on the property of the light source inside it.

So, in an older home that has not seen dedicated energy efficiency work recently, the question is probably "incandescent or CFL?" A diffraction grating will show the difference. In a home where the owner pursues energy savings, the question is probably "CFL or LED?" A diffraction grating will sort them out. If the space could well have incandescents AND LED lamps -- good luck.

Attachments:

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Kent Mitchell commented on Tom White's blog post Clean Energy Works Oregon: Total Home Performance
"As a contractor in the region - we frequently wonder how/why you can be a non-profit?  Oregon…"
1 hour ago
Craig Foley posted a status
"Support the SAVE Act. Legislation would add energy costs to underwriting process. NJ article at: http://goo.gl/f57iGC"
1 hour ago
Bud Poll posted a discussion

Basing air exchange on house volume??

I have long objected to including a basement volume when calculating air exchange as it just…See More
1 hour ago
Tom White's video was featured

Twas The Night Before a Clean Energy Christmas

From the foothills of the Rockies, RMI editorial director Pete Bronski reads 'Twas The Night Before a Clean Energy Christmas. Happy Holidays and Happy New Year!
2 hours ago
Tom White's blog post was featured

Clean Energy Works Oregon: Total Home Performance

Clean Energy Works Oregon (CEWO) is the largest nonprofit home performance provider in Oregon,…See More
3 hours ago
j. west replied to billy g pinnick jr's discussion Blower Door Question
"Hi Chad I'm one of the trainers Colin mentioned. Until 8 months ago I was a full time WX…"
3 hours ago
j. west replied to billy g pinnick jr's discussion Blower Door Question
3 hours ago
Colin Genge replied to billy g pinnick jr's discussion Blower Door Question
"I didn't take your comment as a challenge. I agree that his impression of what was occuring is…"
13 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service