Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
ken a
User Rank
Rookie
re: Inside a CFL bulb – Less power, longer life
ken a   7/6/2011 3:48:10 PM
NO RATINGS
The standard deviation of bulb lifetime is much wider for CFL than flourescent.

Etmax
User Rank
Rookie
re: Inside a CFL bulb – Less power, longer life
Etmax   5/22/2011 3:10:04 AM
NO RATINGS
I had incandescents in every room in the house with the exception of the kitchen and family room where we had conventional fluorescence. we had been in the house 8 years and changed only one incandescent globe. About 4 years ago we were given a bunch of GE CFL's to replace the standard size incandescents and have replaced 3 of them already. Given the increased price of them and the greater carbon footprint I would suggest that CFL's only make financial and environmental sense in locations where they run for hours at a time, because they certainly DO NOT last longer in terms of time since first turn on as our experiment has shown. I believe the CFL industry has pulled the wool over everyone's eyes on this one. As they say, the proof of the pudding.....

oreyc
User Rank
Rookie
re: Inside a CFL bulb – Less power, longer life
oreyc   4/21/2011 4:55:37 PM
NO RATINGS
I agree with you, and preheating increases life of tube considerately but it also consumes more energy, in a CFL, a few milliwats plus the added cost...and in buildings, where common areas are lit by CFLs, the PFC becomes very important because it adds up to a lot of noise and distortion, but I haven´t seen the first CFL witha PCF controller

legg
User Rank
Rookie
re: Inside a CFL bulb – Less power, longer life
legg   4/21/2011 1:54:45 PM
NO RATINGS
It would be interesting to know what issues this IC was intended to address, save for IC-controlled inductor saturation. Few commodity CFL incandescent lamp replacements actually use an IC, while demonstrating operation over a considerably wider operating input voltage range, without apparent resonant inductor saturation issues. Perhaps this is more of an issue at 240VAC? Does the IC allow cooler operation? Generate less noise or distortion? Avoid the use of high voltage electrolytic or low temperature film capacitors? Cost less? Use mercury-free tubes? Allow hands-free assembly? Has NXP missed the boat on this one?

mac_droz
User Rank
Rookie
re: Inside a CFL bulb – Less power, longer life
mac_droz   4/19/2011 9:10:06 AM
NO RATINGS
There are 4 major things (problems) that are basic for CFLs: 1. Colour - so called light temperature should always be below 4000K (nice sunny colour for domestic use) unless you're a fan of horror movies. 2. Warm start - if you want to enjoy your energy efficient light for long make sure you buy one with this feature. They're easy to spot - the warm start ones take longer to light up (about 1 sec) and the filaments light up first. This allows the gas to be heated inside to lower the ignition voltage. Most of the CFLs on the market DO NOT have it - manufacturers are sparing 30cc PTC posistor. 3. Position - if you place your CFL upside down it will live shorter because of the temperature - hot air tends to go up and if the electronics PCB is higher then the light tube then it heats more. The last CFLs I bought have even a warning on the box. 4. All (to my knowledge) CFLs at the market now DO NOT have any power factor correction therefore they draw non-sinusoidal highly distorted current (spikes with amplitude 5 times higher then RMS value). That is normally not a problem for a domestic lighting but may be a problem in a big building (neutrals wires overheating in 3 phase system) and makes the grid a bit less effective. Fortunately power drawn by CFLs (domestic) are just a small percentage of the whole power to make it a significant problem.



Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Book Review: Deadly Odds by Allen Wyler
Max Maxfield
11 comments
Generally speaking, when it comes to settling down with a good book, I tend to gravitate towards science fiction and science fantasy. Having said this, I do spend a lot of time reading ...

Martin Rowe

No 2014 Punkin Chunkin, What Will You Do?
Martin Rowe
1 Comment
American Thanksgiving is next week, and while some people watch (American) football all day, the real competition on TV has become Punkin Chunkin. But there will be no Punkin Chunkin on TV ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
13 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Martin Rowe

Book Review: Controlling Radiated Emissions by Design
Martin Rowe
1 Comment
Controlling Radiated Emissions by Design, Third Edition, by Michel Mardiguian. Contributions by Donald L. Sweeney and Roger Swanberg. List price: $89.99 (e-book), $119 (hardcover).