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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?

#321

Post by B1FF_PSUVM »

toss1 wrote: post #305
brlewis wrote: post #223

Earlier quoted context omitted.

Cite please. Was that ever really a law anywhere other than Victoria, Australia?

Actually it is the law at every trade show I've ever exhibited at, just about to the point where you can't plug in anything without a union electrician doing it. One can usually get away with plugging in a laptop, but certainly if you need anything more than the single standard 10A 2-outlet power drop, expect to pay and wait for the official electrician (and they will kick you out of the show for violations). Edit: I…

> it is the law at every trade show I've ever exhibited at

I've read that you can't move chairs, etc, either. I understand it's part of the contracts between venues and unions.

Re: What Happened to the 100000 Hour LED Bulbs?

#322

Post by midef »

Cree's 1st generation LED bulbs are one of the worst purchases that I've made. I outfitted my entire house with them, but they started dropping like flies. The failure rate was around 50% and the cost of shipping back a bulb under warranty was the same as buying a new one.

Re: What Happened to the 100000 Hour LED Bulbs?

#323

Post by ataturk »

Sebguer wrote: post #120
dsfyu404ed wrote: post #118

Earlier quoted context omitted.

>requires an electrician to replace the whole fixture would like a word with you. Kind of like how replacing a gas dryer "requires" a licensed plumber to make the gas connection or you're "required" to drive no faster than the speed limit at all times. You're getting the runaround. If it was in a vacant apartment that they were showing to people it would already be fixed. If they cared about getting it done ASAP they…

yeah, darn those pesky laws around liability getting in the way of some good old-fashioned handiwork.

Installing a gas stove or dryer is trivial work. It's chickenshit to make a plumber do it.

Re: What Happened to the 100000 Hour LED Bulbs?

#324

Post by darkmighty »

Pheide1j wrote: post #137
phasetransition wrote: post #105

So, engineering lead of a (outdoor) led Luminaire manufacturer here. And our sales director used to work for one of the biggest Asian light bulb OEMs. Happy to answer specific technical questions out there that this article triggered.

More of a non-technical question, do you see demand for outdoor lights at the red end of the spectrum? Supposedly that's better for night vision, light pollution and various animals. But everywhere I go I see yellowish sodium vapor lights replaced with white LEDs.

I think it's a shame sodium vapor lamps are being replaced. Low pressure sodium (LPS) is actually highly efficient, provide a very soothing color for nighttime, and for me most importantly are easily filtered by astronomical observations (their spectrum is nearly a single line). Their size and unwieldiness is justified in utility street lightning setting.

http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?2001IAU...

Re: What Happened to the 100000 Hour LED Bulbs?

#325

Post by Consultant32452 »

JohnTHaller wrote: post #150
Consultant32452 wrote: post #142

Earlier quoted context omitted.

As long as you're just replacing the fixture and not running new line a handy man type person can do it legally.

Generally, a landlord wants someone licensed with insurance to handle something like that on the off chance something goes wrong. I was going to fix the fixture in my bathroom that was shorting a bit and burning out bulbs myself. Thankfully I called my owner and he had an electrician come in because it turns out a lot of the conduit above the fixture needed replacing due to age.

People who do handyman work for a living can and should carry liability coverage.

example: https://www.progressivecommercial.com/business-insurance/han...

Re: What Happened to the 100000 Hour LED Bulbs?

#326

Post by phasetransition »

vanderZwan wrote: post #310
phasetransition wrote: post #105

So, engineering lead of a (outdoor) led Luminaire manufacturer here. And our sales director used to work for one of the biggest Asian light bulb OEMs. Happy to answer specific technical questions out there that this article triggered.

Is there a way for me to know whether or not an LED bulb will have a proper driver that does not throw away half the current and produce a "strobe" before I buy it? The flickering (in the presence of moving things) drives me crazy.

As above, look for architectural bulbs that are deep dimming rated (< 10% dimming). They cost more. I personally have had good luck with Cree, but probably the other top shelf vendors have similarly good products.

Re: What Happened to the 100000 Hour LED Bulbs?

#327

Post by phasetransition »

Guereric wrote: post #319
phasetransition wrote: post #105

So, engineering lead of a (outdoor) led Luminaire manufacturer here. And our sales director used to work for one of the biggest Asian light bulb OEMs. Happy to answer specific technical questions out there that this article triggered.

What do you think of the Phoebus cartel? Is a form of it still continuing nowadays?

Can't speak to any of that. The appearance to me as a consumer walking around with an engineering eye, is that the early days of expensive higher end, store exclusive home LED bulbs (e.g. Cree at Home Depot) has given away to an all out price war.

Re: What Happened to the 100000 Hour LED Bulbs?

#328

Post by SomeHacker44 »

Tharkun wrote: post #85
phkahler wrote: post #69

Earlier quoted context omitted.

Having an AC to DC converter at the mains to your house would be great. Using a reasonably safe 48V DC in the home seems reasonable. Modern high efficiency motor driven appliances all use internal AC->DC converters and a 3-phase DC->AC driver anyway. I'm still on the fence about what the DC voltage should be - upwards of 60-80 are still nice and require less current for a given load but you don't want your PC and TV…

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

I have a big 48 port PoE switch (Ubiquity) and power tons of devices from it. You can get a GbE PoE “uninjector” which will give you a 5V micro USB output and use that to power tons of things all over the house, while also leaving the GbE usable at full speed (on Amazon). I also buy PoE versions of things whenever possible. I even have PoE switches powered by the core switch and home automation gear powered by PoE (e.g. Control4). Great low wattage DC distribution, and getting greater with PoE++ (I have just one 4 port PoE++ for now, but it is also 10GbE.)

Re: What Happened to the 100000 Hour LED Bulbs?

#330

Post by TorKlingberg »

jws wrote: post #84
Someone1234 wrote: post #64

Earlier quoted context omitted.

Slight tangent but "in-building DC" exists, and is rapidly gaining popularity but not via the medium many assumed: Power Over Ethernet. You can buy PoE LED light fixtures now, which are both powered and controlled over ethernet. You buy a single PoE switch, run some low voltage Cat6, and you can power an entire floor's worth of lighting. EEPoE (Energy Efficient PoE) offers more efficient PoE too which claims up to 94…

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?
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