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.


Tags: CFL, light, lighting, meter, tools

Views: 102

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.




  • Add Videos
  • View All


Latest Activity

Paul Raymer posted a blog post

Healthy Home Evaluator Training

Fall River, MA     October 13, 2016…See More
2 hours ago
Diane Chojnowski updated an event

Better homes video series at Seventhwave

October 24, 2016 to January 26, 2017
4 hours ago
Profile Iconseoeleczo and Parfait Pouliotte joined Home Energy Pros
5 hours ago
Amber Vignieri's blog post was featured
5 hours ago
Sarah Holloway's blog post was featured
5 hours ago
Quinn Korzeniecki added a discussion to the group Building Performance Institute (BPI)

Creating a Home that is Right for You and Your Family

Today's prospective homeowners have the option of either buying an existing home or building one…See More
5 hours ago
Steven Lefler commented on Paul Scheckel's blog post Gas vs Induction Cooking Energy Comparison
"No one in government wants you to disconnect from the grid. All electric houses (ON Gird) with Time…"
Ruben commented on Paul Scheckel's blog post Gas vs Induction Cooking Energy Comparison
"I am not arguing about the cost of the unit of energy to the consumer and I am not talking about…"

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service