HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 2/6  >  >>
Charles Murray
User Rank
Blogger
Re: Question
Charles Murray   5/1/2013 9:54:32 PM
NO RATINGS
Thanks AnandY. I knew of a family whose son had an epileptic seizure after playing hours of a computerized basketball game.

Rob Spiegel
User Rank
Blogger
Re: Product improvement
Rob Spiegel   5/1/2013 4:34:26 PM
NO RATINGS
Good questions, Manning6. From your assessment, it seems the LED lights would last about half as long as they would without the flicker correction. If the flickering bothers you, this may be a reasonable trade-off.

Ralphy Boy
User Rank
Platinum
Re: Product improvement
Ralphy Boy   5/1/2013 3:55:07 PM
NO RATINGS
My ex has epilepsy. One year we both fell into the Christmas Tree as she had a seizure and I tried to catch her. I would suggest that the makers of AC LED lighting be very careful about flickering. Flickering lights can be a trigger for epileptic seizures.

Without researching the issue I'd guess that LEDs have a sharper on/off brightness response than a heated wire does.  

On another note, I've taken night shots at the drag races; the ones where I slow the exposure and follow the cars have clear car images, blurred stationary stuff (fences and guard rails for instance), and stretched out multi-pulsed images of the high wattage track lights... The first time I saw it it was a surprise.

icefield
User Rank
Bronze
Re: One warning
icefield   5/1/2013 11:50:30 AM
NO RATINGS
@D. Sherman.

16-2/3Hz is still used in some European railway systems. It's a pain when trying to filter magnetometer signals at 50/60Hz to then also have to worry about the lower (indeed more troublesome) noise.

Elizabeth M
User Rank
Blogger
Re: Product improvement
Elizabeth M   5/1/2013 8:55:41 AM
NO RATINGS
Annother ingenious fix from one of our great gadget geeks. I will keep this in mind for when Xmas season rolls around again and I want some energy efficient, non-headache-inducing lights!

NadineJ
User Rank
Platinum
Re: Product improvement
NadineJ   4/30/2013 11:32:34 PM
NO RATINGS
AnandY-That's true.  Here in San Francisco, Halloween lights are very popular.  And, many use the lights inside year-round for ambience and outside for parties. 

KenL
User Rank
Gold
Re: Safety
KenL   4/30/2013 11:03:30 PM
NO RATINGS
You could just spend a little more, and buy strings that are made as full wave, and already have UL listing.

http://www.holidayleds.com/articles/led_full_wave_christmas_lights

http://www.holidayleds.com/what_does_rectified_or_full_wave_mean

 

Here's a photo that shows that full wave still flickers (at 120Hz)

http://www.habsch.ca/flicker.jpg

 

szyhxc
User Rank
Iron
Re: One warning
szyhxc   4/30/2013 7:21:23 PM
NO RATINGS
All outdoor uses should be GFI protected. 

szyhxc
User Rank
Iron
Re: One warning
szyhxc   4/30/2013 6:49:54 PM
NO RATINGS
I agree with D Sherman.  In my household I am the only one who deals with electrical Christmas decorations so I was not concerned.  Using the slavaged plug from a scrapped string of mini lights will give 3 amp protection for most erroneously pluged in devices.  Plugging in a string of incandescent mini lights will not be a problem.  I have done this and they work OK.

szyhxc
User Rank
Iron
Re: This can be even better
szyhxc   4/30/2013 6:32:37 PM
NO RATINGS
I was going for cheap and I found it.

<<  <  Page 2/6  >  >>


Partner Zone
Latest Analysis
Adam Berger hacked a computer keyboard into a mini key-tar to play with his band.
Altair has released an update of its HyperWorks computer-aided engineering simulation suite that includes new features focusing on four key areas of product design: performance optimization, lightweight design, lead-time reduction, and new technologies.
At IMTS last week, Stratasys introduced two new multi-materials PolyJet 3D printers, plus a new UV-resistant material for its FDM production 3D printers. They can be used in making jigs and fixtures, as well as prototypes and small runs of production parts.
In a line of ultra-futuristic projects, DARPA is developing a brain microchip that will help heal the bodies and minds of soldiers. A final product is far off, but preliminary chips are already being tested.
If you're planning to develop a product that uses a microcontroller, you'll want to take note of next week's Design News Continuing Education course, "MCU Software Development A Step-by-Step Guide."
More:Blogs|News
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 22 - 26, MCU Software Development A Step-by-Step Guide (Using a Real Eval Board)
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service