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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?

#401

Post by Brakenshire »

foxhop wrote: post #388
Brakenshire wrote: post #61

Earlier quoted context omitted.

It's also heating the ceiling, which will reduce the efficiency further. It's a straightforward issue of separation of concerns, there are some occasions where you want heating and lighting always tied together, but they are niche. Almost everywhere in the world you have large periods of the day or year when you want lighting without heat.

I use a desk lamp so It's really close to me and I get both the light and heat and I swap the bulb out for an LED during summer.

Ah, I see, that’s a good idea.

Re: What Happened to the 100000 Hour LED Bulbs?

#402

Post by DubiousPusher »

TheSpiceIsLife wrote: post #378
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…

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.

Yeah, please don't rely on your eye sight to tell you if a tool is operating. Every time a tool is running you should know it is because you started it to a specific purpose.

Before you start a tool you should act out your planned motion. Then start the tool and only perform this motion. If something changes and you cannot complete the motion, stop the tool immediately. Following this and a few other safety tips I've operated power tools for years without incident and I'm legally blind.

Re: What Happened to the 100000 Hour LED Bulbs?

#403

Post by roenxi »

dsfyu404ed wrote: post #400
icelancer wrote: post #391

Earlier quoted context omitted.

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.

Nobody? That is a high bar. Mechanics tend to be pretty cluey, but for the effort of getting proper lighting why nobody should be taking that sort of risk. Sight is one of those fundamental lets-feed-in-useful-information sensors for keeping situations safe.

Re: What Happened to the 100000 Hour LED Bulbs?

#404

Post by poopchute »

TorKlingberg wrote: post #330
jws wrote: post #84

Earlier quoted context omitted.

EEPoE is new to me: Microsemi's exclusive EEPoE technology cuts the power losses on Ethernet cables by 50%, through the utilization of all the copper available on cable when a Microsemi EEPoE PSE IC or Midspan is used. It is 100% compatible with IEEE802.3at, and the savings work with ANY IEEE 802.3at Type 2, Type 1 or IEEE 802.3af compliant PD. In practice, devices that consume 25.5W would consume less than 27.75W, i…

Does that mean you cannot use it for any regular Ethernet data signaling at the same time, or is the signal overloaded on the DC?

You can. I used to work for an ISP and every WiFi access point I installed had Ethernet+DC over the same cat6 cable. Still got 100 megabit speeds

Re: What Happened to the 100000 Hour LED Bulbs?

#405

Post by dsfyu404ed »

roenxi wrote: post #403
dsfyu404ed wrote: post #400

Earlier quoted context omitted.

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.

Nobody? That is a high bar. Mechanics tend to be pretty cluey, but for the effort of getting proper lighting why nobody should be taking that sort of risk. Sight is one of those fundamental lets-feed-in-useful-information sensors for keeping situations safe.

Most people spec'ing out machine shops are not experts in lighting other than more = better. This is a really, really low risk we're talking about. Like basically the stars have to align for someone to get hurt.

Re: What Happened to the 100000 Hour LED Bulbs?

#406

Post by 14 »

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…

This concerns me. About a year ago I went onto a website and ordered 56 led bulbs for my entire house and thought I got a fairly good deal. They worked seemingly well but my eyes always felt strained when under them. Just took my iphone and can definitely see the flicker with slow motion. And when I look at items as I move my head across the room I feel like I can see it as you say and never really knew what I was experiencing before. As someone who always talks about having sensitive eyes to light I am definitely not happy about this and am now thinking about buying flicker free bulbs. Thanks for sharing.

Re: What Happened to the 100000 Hour LED Bulbs?

#407

Post by cogman10 »

masklinn wrote: post #347
Jedd wrote: post #318

Earlier quoted context omitted.

A metal working friend told me recently that in Australia we're not meant / allowed to use fluorescent lights above lathes, as the flicker can disguise movement. This is slightly worrying.

Yeah gas discharge lamps (CFL, neons, halides) will flicker at twice the mains' frequency on a single-phase circuit, makes it very dangerous to use them as e.g. factory lighting. You can mitigate that by using 3-phase power supplies, high-frequency controller, or by supplementing the basic lighting with incandescent bulbs around machinery. The stroboscopic effect is really fun right until you're in a place with lots…

Modern CFL drivers have frequencies in the tens of kilohertz.

The flicker is a thing from the past (or should be).

Re: What Happened to the 100000 Hour LED Bulbs?

#408

Post by snaily »

jandrese wrote: post #399
phasetransition wrote: post #262

Earlier quoted context omitted.

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?

Incandescents used to be 5% visible light at best, with 95% of energy turned into non-visible radiation.

Re: What Happened to the 100000 Hour LED Bulbs?

#409

Post by djsumdog »

jiveturkey wrote: post #236
lucb1e wrote: post #218

... so what happened to the 100k hour LED bulbs? It never answers the question. It has an anecdote about the author's own lamps that ran an estimated 15-20k hours with an advertised lifespan of 30k and have degraded to the point where they will replace them. That's n=1 and nowhere near 100k hours, or even 50k as the author mentions early-adopters will remember seeing advertised. The article contains a lot of info, bu…

as with many such articles, the title is rhetorical and not intended to be answered.

Is it in this case. I presume that at one time there were actual bulbs which said 100,000 hours on the physical box. What specifically happened here? Do we have the same bulbs today and the marketing was wrong, or are bulbs today de-engineered?

Re: What Happened to the 100000 Hour LED Bulbs?

#410

Post by brachi »

14 wrote: post #406
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…

This concerns me. About a year ago I went onto a website and ordered 56 led bulbs for my entire house and thought I got a fairly good deal. They worked seemingly well but my eyes always felt strained when under them. Just took my iphone and can definitely see the flicker with slow motion. And when I look at items as I move my head across the room I feel like I can see it as you say and never really knew what I was ex…

Next time, a good resource is https://ledstrain.org/. I found it here in HN and is quite informative for makign decisions on what to buy.
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