Has anybody tried this new style led bulb?

velvetfoot Posted By velvetfoot, Jul 25, 2017 at 9:46 AM

  1. kborndale

    kborndale
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    15000 hours is very a low life span, most led bulbs are rated at 50000 hours. 15000 is what CFL's are typically rated at.
     
  2. Seasoned Oak

    Seasoned Oak
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    Seems they do have reliable 100 watt equiv bulbs now,iv only had 1 go bad since buying about 15. Would like to start using 150-200 watt equiv bulbs for work lights but still too many bad reviews on those.
     
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  3. Corey

    Corey
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    I have several of the 'long filament' style in use and they seem to work fine. A few observations - several already stated:

    The electronics are so small because the 'filament' is actually dozens, if not hundreds of LEDs in series, so the overall voltage the filament needs is 120V. So no step down package is needed.

    Not sure how I feel about dozens/hundreds of LEDs in series...if one dies, does the whole filament die? - though I have not had that happen in several years of use.

    I seriously doubt there is helium inside. It would make no sense to go to the cost / expense of adding helium inside when the bulb is surrounded by air outside. Air inside and air outside is essentially the same thermal conductivity.

    Due to having no real electronics, there is some notable 60Hz flicker - though I think I am more sensitive to this than some. I particularly notice it when trying to read or do detail work in the light of one. Though these are really more decorative - not reading or work lamps.

    They are 'sort of' dimmable. Again, with no real electronics, cutting voltage to the LED does result in less light. A couple of issues - lowering voltage to a LED typically makes the light more blue / cool (just the opposite of an incandescent bulb which gets more orange / warmer) So these take on an odd hue when dimmed - and flicker can become even more noticeable.

    The one issue I've had - one bulb was delivered with the spot weld to one filament broken loose from the end support. Not really noticeable, but I'd inspect that portion closely.

    -g2-M01-E4-61-rBVaG1ZMdZ2AF7ThAAGq5YXTS9Q261.jpg%2Fvintage-led-long-filament-bulb-4w-6w-8w-super.jpg
     
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  4. Gunfixr

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    Well, in my case, the downsides just aren't. The only long filament led bulbs i'm using are in a chandelier, in the dining room. It only gets used occasionally, and only enough light to eat by is needed, it's as much ambiance as illumination.
    Which was why they were chosen.
    For me, they work for the purpose.
     
  5. Seasoned Oak

    Seasoned Oak
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    Its nice that LEDs are easily made to look like antique bulbs.
     
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  6. velvetfoot

    velvetfoot
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    Yeah, but the second one went out yesterday! Maybe same batch. Same location, bathroom, but it really doesn't get that moist in there.
     
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  7. begreen

    begreen
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    What I like the most is that LED bulbs have progressed greatly from the early engineering oddities with big heat sinks and odd workarounds to diffuse illumination, often with a cathode cold light. Now they are in almost any form factor and work nicely as incandescent replacements.
     
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  8. Ashful

    Ashful
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    Just saw this. I actually bought three filament type LEDs for one of my three my lamp posts, to give them a whirl. They still don’t quite match the warmth and spectrum of incandescent, but they are damn good. The only issue I have had with them is that my lamp post fixtures tend to fog up inside, or even frost up in winter, without the warmth of the incandescent to bake it out. Not yet determined if I’ll go with them in the other lamp posts, or switch back, giving myself some time to decide.
     
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  9. Brian26

    Brian26
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    At work we retrofitted about 10 large 20k+ sqft retail box stores over to all led lighting in just about every form. The bulb failure rate is insanely low. Out of thousands of led tubes I have seen less than 10 fail over a few year period. Perhaps the commercial stuff is more robust but these bulbs have saved a fortune in both energy and eliminated the labor/money in bulb maintenance.
     
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  10. Gunfixr

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    I have regular led bulbs throughout the house, only have the early style filament bulbs in 1 or 2 places, specifically for ambience. They aren't used regularly, like the regular bulbs are.
     
  11. woodgeek

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    Dude, the gas fill is a key part of the design. A tiny squirt of helium (or another low MW gas) at the optimal pressure (below atmospheric I think) cost nothing compared to the old heavy metal heat sinks. A kids ballon could fill dozens of these things.

    Your thinking seems to be that even if the gas in the bulb was higher thermal conductivity that air, it wouldn't help, bc it would still have to dump the heat into the air outside the bulb. That is not correct. The gas fill is spreading the (quite concentrated) heat in the small filaments to the large area of the bulb, and can do it quite effectively. Just like a metal heat sink spread the heat from a small diode to a large fin. You will notices that they spread out the filaments carefully, so they don't heat each other.

    Of course, you can poke a hole in one, fire it up, and see if it continues to function for a long time. And let us know.
     
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