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What Happened to the 100000 Hour LED Bulbs?

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Re: What Happened to the 100000 Hour LED Bulbs?

#391

Post by icelancer »

handzbagz wrote: post #383
TheSpiceIsLife wrote: post #378

Earlier quoted context omitted.

LED flicker could prove harmful or fatal if you work with anything that rotates or reciprocates. The rotating / reciprocating mass may appear stationary at some RPM. Just a reminder to only ever use incandescent or halogen lights around machinery you can touch while in operation: drills, lathes, mills, slotting machines, etc.

Just how likely is this to happen though, it would have to be the only light source and be flickering with exactly the same frequency as the machinery is traveling at (which i assume for most devices varies a lot). Not saying it can't happen but it does seem stupidly hard to achieve.

This is uncommon but not rare. Have you ever seen wheel blur or other artifacting of such? It's very easy to make happen artificially under controlled conditions which means it can't be that hard to happen accidentally.

Edited to add: Have you ever heard of a timing light for an engine? This works exactly the way you are describing.

Re: What Happened to the 100000 Hour LED Bulbs?

#392

Post by arm »

mrb wrote: post #235

Lifetime isn't even my #1 concern with LED bulbs. It's strobing/flickering. I film all the LED bulbs I buy in slow motion at 240 fps with an Android phone, and play the movie back on a PC with mplayer using the dot(".") key to move frame by frame. Here is a shot I made comparing 2 brands of LED bulbs: https://youtu.be/QbenId_F2RQ (Edit: yeah you don't have to transfer to a PC, just playing back in slow motion on the…

Have to mention this¹ big HN thread from 2 months ago with lots of discussion about that exact issue.

――――――

¹ — https://news.ycombinator.com/item?id=18644590

Re: What Happened to the 100000 Hour LED Bulbs?

#393

Post by slavik81 »

setquk wrote: post #250
darepublic wrote: post #244

Earlier quoted context omitted.

> Alas this isn't a problem. It is a problem in the sense that it creates waste and pollution. There is a cost to throwing things out, and for shipping things across the country without limit.

Goes in the WEEE recycling here and is recycled so the impact isn’t as high as it may be elsewhere. I do agree with you fundamentally however.

How much less is the impact?

Re: What Happened to the 100000 Hour LED Bulbs?

#394

Post by m463 »

handzbagz wrote: post #383
TheSpiceIsLife wrote: post #378

Earlier quoted context omitted.

LED flicker could prove harmful or fatal if you work with anything that rotates or reciprocates. The rotating / reciprocating mass may appear stationary at some RPM. Just a reminder to only ever use incandescent or halogen lights around machinery you can touch while in operation: drills, lathes, mills, slotting machines, etc.

Just how likely is this to happen though, it would have to be the only light source and be flickering with exactly the same frequency as the machinery is traveling at (which i assume for most devices varies a lot). Not saying it can't happen but it does seem stupidly hard to achieve.

I would imagine there's a higher-than-average chance of this because most AC motors are definitely syncronized with the 60hz (or 50hz) AC source. There's a chance the lights might also derive from this.

Re: What Happened to the 100000 Hour LED Bulbs?

#395

Post by MPSimmons »

mrb wrote: post #235

Lifetime isn't even my #1 concern with LED bulbs. It's strobing/flickering. I film all the LED bulbs I buy in slow motion at 240 fps with an Android phone, and play the movie back on a PC with mplayer using the dot(".") key to move frame by frame. Here is a shot I made comparing 2 brands of LED bulbs: https://youtu.be/QbenId_F2RQ (Edit: yeah you don't have to transfer to a PC, just playing back in slow motion on the…

I can spot a Cadillac or GMC vehicle on the road a mile behind it from the flicker of the taillights. It's terrible.

Re: What Happened to the 100000 Hour LED Bulbs?

#396

Post by squarefoot »

phasetransition wrote: post #205
nouveaux wrote: post #144

Earlier quoted context omitted.

So which led light bulb do you install in your house?

Ikea when the size is available, for reasons I cannot discuss here.

Seconded that. I switched to Ikea lamps back in the CFL days and today use their LED bulbs and lamps with no problems at all. Of course they're not manufactured by Ikea, but whichever is the maker it seems a very reliable one.

Re: What Happened to the 100000 Hour LED Bulbs?

#397

Post by bootlooped »

handzbagz wrote: post #383
TheSpiceIsLife wrote: post #378

Earlier quoted context omitted.

LED flicker could prove harmful or fatal if you work with anything that rotates or reciprocates. The rotating / reciprocating mass may appear stationary at some RPM. Just a reminder to only ever use incandescent or halogen lights around machinery you can touch while in operation: drills, lathes, mills, slotting machines, etc.

Just how likely is this to happen though, it would have to be the only light source and be flickering with exactly the same frequency as the machinery is traveling at (which i assume for most devices varies a lot). Not saying it can't happen but it does seem stupidly hard to achieve.

You would also have to ignore or miss any other signs of very fast rotation, such as noise or air movement or the power switch being on.

Re: What Happened to the 100000 Hour LED Bulbs?

#398

Post by jandrese »

bronson wrote: post #374
jandrese wrote: post #226

Earlier quoted context omitted.

Isn't this like saying you could light the world if you had a big enough switch and unlimited cable?

Where did you get that? GP is talking about lighting a floor in a building.

He's talking about running a separate cable for each and every bulb. It's a wasteful solution compared to running all of the lights off of a single circuit (or limited number of circuits) like a normal building.

Re: What Happened to the 100000 Hour LED Bulbs?

#399

Post by jandrese »

phasetransition wrote: post #262
jandrese wrote: post #217

Earlier quoted context omitted.

Why do so many of the bulbs run hot? Like so hot you can't hold them in your hand if they were on when you unscrewed them. Isn't this a lot of wasted energy?

All bulbs produce heat, both from the LEDs and the electronics. Incandescent bulbs were blazing hot, too, and they radiated IR on top everything else. A high efficiency LED assembly is still producing on the order of 50% light and 50% heat.

High efficiency is only 50%? Isn't that terrible? Are LEDs really that bad?

Re: What Happened to the 100000 Hour LED Bulbs?

#400

Post by dsfyu404ed »

icelancer wrote: post #391
handzbagz wrote: post #383

Earlier quoted context omitted.

Just how likely is this to happen though, it would have to be the only light source and be flickering with exactly the same frequency as the machinery is traveling at (which i assume for most devices varies a lot). Not saying it can't happen but it does seem stupidly hard to achieve.

This is uncommon but not rare. Have you ever seen wheel blur or other artifacting of such? It's very easy to make happen artificially under controlled conditions which means it can't be that hard to happen accidentally. Edited to add: Have you ever heard of a timing light for an engine? This works exactly the way you are describing.

The effect might not be rare but getting hurt by it is incredibly rare. Machines produce noise and vibration. Nobody is going to be fooled and try to pull a moving part out of a lathe because of some LED lighting except in the most exceptional or bizarre circumstances.
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