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: 50

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

Chris Laumer-Giddens's blog post was featured

Mini-Split Heat Pumps are Quirky, Especially their Capacity

Mini-Split Heat Pumps are Quirky and Still EffectiveThe name "mini-splits" generally refers to heat…See More
38 minutes ago
Melissa Ulbricht's blog post was featured

When windows aren't the culprit of a leaky building, solve the mystery with an energy audit.

Liz Vogel replaced the windows and updated the heating system in her small multifamily building in…See More
38 minutes ago
Elizabeth Coe is now a member of Home Energy Pros
1 hour ago
Trip Smith replied to Trip Smith's discussion Where to spend my marketing dollars?
"Thanks for the reply Kim! I've checked out your profile and it appears you work for the…"
1 hour ago
Aaren Stewart posted a discussion

Let's solve this HVAC quiz!!!

Answer these three simple problems of your HVAC systems, let's see how much you know your system…See More
8 hours ago
Chris Laumer-Giddens posted a blog post

Mini-Split Heat Pumps are Quirky, Especially their Capacity

Mini-Split Heat Pumps are Quirky and Still EffectiveThe name "mini-splits" generally refers to heat…See More
17 hours ago
Jan Green posted an event

Solar Course for Appraisers at SRP's Pera Club

November 13, 2014 to November 14, 2014
"As the US continues to search for energy alternatives, properties improved with solar PV…See More
17 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"Just like paint.  RFoller and brush or strong airless sprayer.  It has the consistency of…"
20 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service