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BigBlarg

join:2008-02-10
Longueuil, QC
kudos:1
Reviews:
·ELECTRONICBOX
reply to Dude111

Re: [Rant] LED lights are ugly crap

I found the explanation for the led refresh rate :

quote:
If you have an LED that is rated for 30 mA, you can drive it with 50 mA pulses which exceed the maximum current for the LED. However, as long as the pulse frequency is pretty fast and the average current (averaging 50 mA and 0 mA for when the pulses are on and off) doesn't exceed 30 mA then the LED will be just fine.
It would seem most led lights use this, but it would still be possible to make led lights that doesn't flicker. Pulsating weak LEDs must be cheaper than a current voltage in strong LEDs.


Dustyn
Premium
join:2003-02-26
Ontario, CAN
kudos:11

I don't think I've ever come across a Christmas LED light that doesn't have that strobing flickering effect. Are the high quality ones that mimic incandescents sold in high end department stores? All I see at Canadian Tire, Wallmart or Home Hardware are the same flickery LED light pulses that are dizzying to look at.
--
Remember that cool hidden "Graffiti Wall" here on BBR? After the name change I became the "owner", so to speak as it became: Dustyn's Wall »[Serious] RIP



BigBlarg

join:2008-02-10
Longueuil, QC
kudos:1
Reviews:
·ELECTRONICBOX

said by Dustyn:

I don't think I've ever come across a Christmas LED light that doesn't have that strobing flickering effect. Are the high quality ones that mimic incandescents sold in high end department stores? All I see at Canadian Tire, Wallmart or Home Hardware are the same flickery LED light pulses that are dizzying to look at.

Like I said, it's probably cheaper to produce by using weaker LEDs and pulse them. Higher quality products would probably be too expensive and wouldn't sell well at all.


La Luna
RIP Lisa
Premium
join:2001-07-12
Warwick, NY
kudos:3
reply to Dustyn

said by Dustyn:

I don't think I've ever come across a Christmas LED light that doesn't have that strobing flickering effect. Are the high quality ones that mimic incandescents sold in high end department stores? All I see at Canadian Tire, Wallmart or Home Hardware are the same flickery LED light pulses that are dizzying to look at.

Why do you see "strobing flickering" and I don't? Not saying you don't see it, just don't understand why you would see it and others don't. Weird. I just see bright, crisp, clear beautiful colors.
--
The Alien in the White House

20,085 DEADLY TERROR ATTACKS SINCE 9/11


Dustyn
Premium
join:2003-02-26
Ontario, CAN
kudos:11

1 recommendation

It's just the way LED bulb technology is as they are designed to turn on and off very quickly. In most cases it's not perceptive by the human eye, but for some it is. Most are 60Hz as they run off 60Hz AC. (reminds me of the 60Hz refresh rate of an old CRT monitor) I haven't been able to find any that are twice as bright at 120Hz. These are supposedly flicker free, but they still flicker... just at a much faster rate. As BigBlarg See Profile mentioned you could use a full-wave bridge rectifier at the socket end of the strand to get 120Hz.
»en.wikipedia.org/wiki/Christmas_···chnology
»boards.straightdope.com/sdmb/sho···t=583097
The above link I found quite interesting.
--
Remember that cool hidden "Graffiti Wall" here on BBR? After the name change I became the "owner", so to speak as it became: Dustyn's Wall »[Serious] RIP



Fir_Na_Tine
Giggity Giggity
Premium
join:2001-01-03
Sout Joisy

Thanks for those links. Interesting read on something as simple as Xmas lights. I'm not a fan of the LED ones, although I have two stands in use but the rest are regular ones. Like the Wikipedia said I notice the Stroboscopic effect mostly when looking from side to side or moving across the field of view.
--
"When the power of love overcomes the love of power, the world will know peace."
-Jimi Hendrix

Expand your moderator at work


Anonymous_
Anonymous
Premium
join:2004-06-21
127.0.0.1
kudos:2
Reviews:
·Time Warner Cable

1 edit
reply to La Luna

Re: [Rant] LED lights are ugly crap

said by La Luna:

said by Dustyn:

I don't think I've ever come across a Christmas LED light that doesn't have that strobing flickering effect. Are the high quality ones that mimic incandescents sold in high end department stores? All I see at Canadian Tire, Wallmart or Home Hardware are the same flickery LED light pulses that are dizzying to look at.

Why do you see "strobing flickering" and I don't? Not saying you don't see it, just don't understand why you would see it and others don't. Weird. I just see bright, crisp, clear beautiful colors.

Evolution

we have super human eyes that can detect motion and light better I seriously I have to crank up the refresh rate to about 120hz+ just to get rid of the flickering on CRT computer screens

LCD's must be below 12ms to eliminate the detectable pixel refresh

My brother had a screen that was 24ms I could see as each pixel refreshed and they did not refresh at the exact sametime and not of the same exact shade of color. Fairly annoying as I would get severe eye strain with in minutes.


Fir_Na_Tine
Giggity Giggity
Premium
join:2001-01-03
Sout Joisy

said by Anonymous_:

said by La Luna:

said by Dustyn:

I don't think I've ever come across a Christmas LED light that doesn't have that strobing flickering effect. Are the high quality ones that mimic incandescents sold in high end department stores? All I see at Canadian Tire, Wallmart or Home Hardware are the same flickery LED light pulses that are dizzying to look at.

Why do you see "strobing flickering" and I don't? Not saying you don't see it, just don't understand why you would see it and others don't. Weird. I just see bright, crisp, clear beautiful colors.

Evolution

we have super human eyes that can detect motion and light better I seriously I have to crank up the refresh rate to about 120hz+ just to get rid of the flickering on CRT computer screens

LCD's must be below 12ms to eliminate the detectable pixel refresh

My brother had a screen that was 24ms I could see as each pixel refreshed and they did not refresh at the exact sametime and not of the same exact shade of color. Fairly annoying as I would get severe eye strain with in minutes.

I was behind a Mercedes before with LED tail lights and when sitting at a red light I almost wanted to put on sunglasses as his brake lights were so bright it lit up the whole interior of my car red, like I was driving thru hell or something. His running lights were as bright as most other cars brake lights.

Also some police cars with LED light bars are a bit too bright. I know they need to be seen for safety but shouldn't be blinding you.
--
"When the power of love overcomes the love of power, the world will know peace."
-Jimi Hendrix