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Gadget Freak Case #239: Bridge Rectifier Eliminates LED Light Flicker
4/29/2013

One you plug the gadget into a wall outlet, you can plug your LED string into the female receptacle.
One you plug the gadget into a wall outlet, you can plug your LED string into the female receptacle.

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Rob Spiegel
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Product improvement
Rob Spiegel   4/29/2013 8:15:55 AM
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This is one of those gadgets that improves on a commercial product. And it makes you wonder why this improvement was not part of the make-up of the original product. Nice job.

naperlou
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Necessary component
naperlou   4/29/2013 10:27:07 AM
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Bernard, this shounds like a necessary component.  I wonder that the manufacturers do not include it.This type of flicker is also something that makes CFLs unattractive to some people.

NadineJ
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Platinum
Re: Product improvement
NadineJ   4/29/2013 10:40:47 AM
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This is very cool.  I get mild headaches from LEDs as well.  I can see these selling quickly during the holidays.  Open the etsy store and start building inventory!

manning6
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Iron
Re: Product improvement
manning6   4/29/2013 6:02:56 PM
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This approach may well shorten the lifetime of the string of LED's. The LED's are brighter because the duty cycle has increased from about .5 too near 1, the average current has increased by a factor of 2 and device (LED) heating has certainly increased. It appears in the video that one of the LED's in the demo string of white LED's has been replaced with a red LED. Was this due to failure of the white LED operating under the more stringent conditions?

Charles Murray
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Question
Charles Murray   4/29/2013 6:27:27 PM
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What a great idea. I do have a question, though. Does this mean that whenever I buy an LED light bulb and run it on AC, I will be subjected to the possibility of the headaches you describe?

Debera Harward
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Silver
Re: Product improvement
Debera Harward   4/29/2013 7:05:10 PM
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Light emitting diodes are becomming very  popular these days people are using them instead of other lights because they are cost effective .Because leds are connected to the AC Supply it produces ripples at the outer end which results in flickering.Any light source which is connected to AC supply results in flickers.

However flickering can be reduced with different methods one method is to use high frequency switching supplies, which helps to reduce the AC component of the main supply and reduces the flickers but not all flickers are avoidable .Remaining flickers can be removed by attenuating g the AC component at  the output

notarboca
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Gold
Re: Product improvement
notarboca   4/29/2013 9:11:24 PM
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Thanks Design News for bringing this modification to "light".  I'll be using this rectfier for holiday lights this season.

greg
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Iron
Re: Product improvement
greg   4/29/2013 10:55:16 PM
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the lifespan of LEDs is freakishly long as it is. shortening it to, say, a quarter, would likely still outlive any of us.

no, i havent done the math.,,

TJ McDermott
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Re: Product improvement
TJ McDermott   4/29/2013 11:02:32 PM
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The answer to just about any why question in this context is going to be money.  Granted, the rectifier is quite inexpensive.  The margin on such products is probably quite low - adding the rectifier while staying cost-competitive won't work.

There's also the cost of getting this now-new product tested by UL so a company can affix the all-important UL label.

OR, the company can just counterfit the label...

AnandY
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Gold
Re: Product improvement
AnandY   4/30/2013 2:14:46 AM
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Today LED lighting is not limited to festival lightings, they are also used in day-today life. old-fashioned incandescent or harsh fluorescent are replaced by bright and shiny new LEDs. The local supermarket, the office where you work, the train station, restaurant or department store—all of these businesses are seeing the benefits of this rapidly developing technology. The light produced by LED bulbs is brighter and warmer and more focused than ever before, and business owners love the savings to their energy bills.

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