Breaking News
Comments
Newest First | Oldest First | Threaded View
Page 1 / 3   >   >>
cafayzieg
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
cafayzieg   10/22/2012 10:13:30 AM
NO RATINGS
I'm glad I can understand these products. Thank you for your article. http://www.league-soft.com

David Taylor
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
David Taylor   10/15/2012 6:39:33 AM
NO RATINGS
Have a try of video converter : http://www.league-soft.com/how-to/convert-avi-to-mp4-mac.html

chinavibratingscreen
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
chinavibratingscreen   9/21/2012 8:58:16 AM
NO RATINGS
Thank you for your sharing, it's very helpful. regards:httP//www.chinavibratingsieve.com

Larry.Cormier1
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
Larry.Cormier1   2/13/2012 9:23:58 PM
NO RATINGS
The decision to go AC vs DC was made a long time ago. Of course, we would not go DC over the distribution network. However, we COULD have a low voltage supply and wire the light switches with a smaller guage wire, needing less robust switches. Perhaps a not trivial reduction in wiring costs, as copper has gone up dramatically. We would still have the AC for appliances and such. It would not be a big deal for new houses. This would mean 2 types of bulbs- DC for new, AC for old. This could be a show stopper due to manufacturers probable unwillingness to have 2 types. But, if LED is the way of the future, why not use it as close to the "raw" state as possible? Cheaper for product, less manufacturing cost, less copper cost, less wiring installation cost. And, less high voltage AC in the walls (BTW, I previously said DC for doorbell, incorrect. It is 12VAC, I think)

Bert22306
User Rank
CEO
re: Cree claims LED price-performance breakthrough
Bert22306   2/13/2012 8:49:10 PM
NO RATINGS
??? Wouldn't it be infinitely less disruptive (and I mean that pejoratively) to stick diodes in the CFL instead, if they prefer DC? DC house current would mean that any appliance that doesn't require strictly 115 V would have to have a switching power supply. Not to mention, the electric utilities would have to co-locate gymongous rectifying circuits where they now have the final distribution transformers that go to 230 VAC. Which means, huge changes all over the distribution network. Not a trivial change.

Larry.Cormier1
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
Larry.Cormier1   2/13/2012 7:37:05 PM
NO RATINGS
I have had somewhat the same results as DrQuine with CFL failures at home. In 2 years, I have replaces maybe 1/2 dozen bulbs out of the 30 or so that I have in service. If one researches, it appears that the failures are due to the electronics associated with start-up. In order to eliminate these issues, is there any effort to start wiring houses with DC for lighting? We already have DC for doorbells. This would be an easy extension, and would eliminate the cost of the start-up circuitry, and the associated failures.

Larry.Cormier1
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
Larry.Cormier1   2/13/2012 7:29:43 PM
NO RATINGS
Accordiong to Cree, "The 231 was a lab/R&D result. The 162 is a commercially available product."

daleste
User Rank
CEO
re: Cree claims LED price-performance breakthrough
daleste   2/13/2012 1:31:23 AM
NO RATINGS
Laser lights. Interesting. How is the light dispersed? I wouldn't want just one little dot of light in the middle of the room.

Bert22306
User Rank
CEO
re: Cree claims LED price-performance breakthrough
Bert22306   2/12/2012 11:50:33 PM
NO RATINGS
We haven't anything remotely close to that. The CFL brands we buy are Sylvania or UtiliTech, which are sold at Best Buy. We've had much better luck than what you describe. Basically, one failure that was premature, within maybe less than a year, one failure in a couple of years (which is also premature, in my book), and the rest keep soldiering on for many years. As to going to laser lights, interesting concept. I wonder if the coherent nature of laser won't create some weird phenomena?

ramstar
User Rank
Rookie
re: Cree claims LED price-performance breakthrough
ramstar   2/11/2012 6:03:33 PM
NO RATINGS
Our electric utility companies distributed many CFL bulbs for free, or at greatly reduced cost when they first came out. The fact that each CFL contains a small amount of mercury makes them much less desirable than LED's when you take into account the disposal cost.

Page 1 / 3   >   >>


EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Aging Brass: Cow Poop vs. Horse Doo-Doo
Max Maxfield
41 comments
As you may recall, one of the things I want to do with the brass panels I'm using in my Inamorata Prognostication Engine is to make them look really old. Since everything is being mounted ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
18 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
12 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
45 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
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)