Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

What Happened to the 100000 Hour LED Bulbs?

hackaday.com

Post reply on HN
Print view View original

241–250 of 519 posts

Re: What Happened to the 100000 Hour LED Bulbs?

#241

Post by spicymaki »

umvi wrote: post #63
spicymaki wrote: post #56

Earlier quoted context omitted.

To convert from AC to DC you need a transformer and a rectifier and there will be energy loss during the conversion.

Right, but my question is would it be better to do the conversion once for the entire house or to make every single device bundle in its own transformer and rectifier as we are currently doing?

I was not clear. The point I was trying to make was that transformers are not perfect in the conversion even when there is no load there is some power loss in the form of heat. Not sure if it is a real problem or not.

Re: What Happened to the 100000 Hour LED Bulbs?

#242

Post by jandrese »

organsnyder wrote: post #183
dwighttk wrote: post #165

And why does every single LED stoplight I see have large segments of unlit LEDs? Seems like some municipalities got sold a pile of crap. At least they work even with the missing lights, but who knows how often they are having to replace those?

Funny... I've never noticed that. Maybe your municipality picked the wrong vendor?

Or he lives in a town where people regularly shoot the stoplights.

Re: What Happened to the 100000 Hour LED Bulbs?

#243

Post by jandrese »

SketchySeaBeast wrote: post #155
lupire wrote: post #148

Earlier quoted context omitted.

Why is it wrong? Halogens are a fire hazard and a heat nuisance.

From an energy expenditure angle it's wrong when you could focus on upgrading washer/dryer/fridge, that sort of thing. But those are good points.

In an energy savings per dollar spent sense that halogen replacement might be the best option.

Re: What Happened to the 100000 Hour LED Bulbs?

#244

Post by darepublic »

setquk wrote: post #12

I've taken every single LED bulb that has failed on me to pieces and it's always the same failure mode. The heatsink compound isn't applied properly to the back of the LED board. The LEDs immediately in the gaps smoke out. Alas this isn't a problem. If a lightbulb goes, Amazon send me a new one out now free of charge and tell me to throw the old one in the trash. This is one manufacturer, prevalent on Amazon, the Lon…

> 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.

Re: What Happened to the 100000 Hour LED Bulbs?

#245

Post by badgers »

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.

My guess is that is has to do with IKEA's improving smart home trend [0]. I like the fact that the work with all three major platforms so I don't necessarily have to be all in on one if I decide to switch in a couple of years: "Trådfri [has] compatibility across Apple HomeKit, Alexa, and Google Assistant".

[0] - https://www.wired.com/story/ikea-fyrtur-smart-blinds/

Re: What Happened to the 100000 Hour LED Bulbs?

#246

Post by Tharkun »

jandrese wrote: post #229
Tharkun wrote: post #85

Earlier quoted context omitted.

PoE seems pretty nice in that regard. Easy to use, lots of appliances run on it, cabling is easy and it can carry data.

Can't carry enough current to run more than some electronics though. PoE vacuum cleaners wouldn't work.

True, but you could certainly charge a roomba over PoE.

Re: What Happened to the 100000 Hour LED Bulbs?

#247

Post by iforgotpassword »

ip26 wrote: post #99
CharlesColeman wrote: post #27

Earlier quoted context omitted.

> The relative cost of lighting on the monthly electricity bill is tiny so those savings are pretty small. Getting a more efficient fridge, washing machine, TV or (in our profession) computer typically has a much bigger effect on electricity expenses. And that is assuming your heating and cooking is done with gas. The switch from using tiny space heaters for light to using LEDs that consume a tenth of the power was a…

To add, your typical laptop these days has a 45W or 65W power supply, which will not be fully loaded most of the time!

Even a moderate desktop with no dedicated graphics would idle at around 30 Watts. I tried taking this further a couple years ago with an i5 and a 200w PSU that was targeting low loads and got to 18w idle.

Re: What Happened to the 100000 Hour LED Bulbs?

#248

Post by telchar »

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…

Perhaps dimmable LED bulbs would be better in that regard? The LED dimmers on the market use a very high rate PWM (afaik) to prevent/minimize flickering at low brightness. I would guess that the dimmable bulbs are designed to work well with intermittent power and so wouldn't have the same problem.

Of course it's still hit or miss, compatibility between bulbs and dimmers seems to be very hard to judge without testing these days.

Re: What Happened to the 100000 Hour LED Bulbs?

#249

Post by masklinn »

droithomme wrote: post #202
masklinn wrote: post #40

Earlier quoted context omitted.

> Sure, eventually, but without further context this obsession with light bulbs always sounds a little bit penny wise and pound foolish to me. Might be, might not be, it all depends on the usage of the various items e.g. let's say I've a 100W incandescent kitchen bulb, it's lit 5h/day on average, an equivalent LED would be 12~15W for ~$5 and will save ~3000Wh per week. Going from a Class A to an A+++ washing machine…

> Going from a Class A to an A+++ washing machine would save ~500Wh/cycle. The major energy cost for clothes washing is heating the water. A rooftop solar water heater dramatically reduces energy use, often more than one would get from using the same space to install solar panels. A front loading washing machine uses less water than a top loading one and will also use less energy for water heating.

> The major energy cost for clothes washing is heating the water. A rooftop solar water heater dramatically reduces energy use, often more than one would get from using the same space to install solar panels.

Most modern washing machine are cold-water only, washing machines with a hot water inlet tend to be prosumer. Same with dishwashers.

Re: What Happened to the 100000 Hour LED Bulbs?

#250

Post by setquk »

darepublic wrote: post #244
setquk wrote: post #12

I've taken every single LED bulb that has failed on me to pieces and it's always the same failure mode. The heatsink compound isn't applied properly to the back of the LED board. The LEDs immediately in the gaps smoke out. Alas this isn't a problem. If a lightbulb goes, Amazon send me a new one out now free of charge and tell me to throw the old one in the trash. This is one manufacturer, prevalent on Amazon, the Lon…

> 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.

Post reply on HN