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Dayum, and I was worried this LED bulb might not be bright enough.
#350475 - 02/21/16 11:47 AM
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Six months ago, I ordered this...
https://smile.amazon.com/gp/product/B00JO0DNTC/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
because I had installed my last 100W bulb on the dimmer switch in here six months before that, and expected it to go out soon.
The old bulb finally died just a few minutes ago, so I was at last able to install the future. Damn this thing is bright by comparison. The switch is currently at a bit less than half. I was ready to start using supplemental lighting (have desk lamp near at hand), but that won't be an issue.
Oddly, the bulb (diffusing cover) is sheathed in a tacky (tactile, not aesthetic) synthetic, despite proclaiming it's "...in real glass...."
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| Tomu Breidah |
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Re: Dayum, and I was worried this LED bulb might not be bright enough.
[Re: TriggerFin]
#350492 - 02/21/16 03:45 PM
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I have a light fixture in my kitchen. I had bought some incandescent bulbs with the smaller part that screws into the socket. But, I did have one LED bulb in one socket. All the other incandescent bulbs burned out, one after the other, over a number of days. I've never had bulbs to burn out that fast, ever.
ETA: Unless they were just really cheap bulbs, I'm prone to think that just because I had an LED bulb in one of the sockets that it must've somehow caused the other bulbs to burn out so quickly. Like, getting just a tad too much voltage. But I dunno. 
Lesson: Don't mix different bulb types in one fixture. 
Edited by Tomu Breidah (02/22/16 07:54 AM)
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LEVEL-4
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Re: Dayum, and I was worried this LED bulb might not be bright enough.
[Re: Tomu Breidah]
#350542 - 02/22/16 01:42 PM
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Not voltage, but current.
If one of the lights going out didn't cause the rest to go out, then that would imply that the bulbs were wired in parallel across the incoming mains to the fixture.
In that case, the amount of voltage to each bulb is the same, but the amount of current is divided up equally across each bulb.
Please note that all of the following numbers are largely made up, but it's to illustrate the point:
Incandescent bulbs are purely resistive loads, so with (let's say) 5 55W bulbs in parallel, each one takes 110V but had a 0.5A load on the circuit.
LED bulbs, by contrast, consume considerably less current. Not zero, but let's assume it's zero because it makes the math easier. Now you have 110V, and that same amount of current (2.5A) being distributed across four incandescent bulbs instead. Each bulb will now be dissipating almost 70 watts! It's no surprise that this would dramatically shorten the lifespan of the bulbs. Once the first of the remaining 4 incandescent bulbs burns out, that's over 90 watts being thrown off by the remaining 3, which accelerates the deterioration even further, so another blows, now there's nearly 140 watts split across the last two, and so on.
So yeah, if you have a single light fixture with multiple bulbs, replace all the bulbs at the same time.
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| Tomu Breidah |
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Thank you [nt]
[Re: MooglyGuy]
#350545 - 02/22/16 04:03 PM
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Makes sense. 
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| redk9258 |
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Re: Dayum, and I was worried this LED bulb might not be bright enough.
[Re: MooglyGuy]
#350558 - 02/23/16 01:00 AM
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The bulbs don't just magically dissipate more power. The power will still be 55 watts per bulb. The reason others burn out is because the filament has hours on it and becomes sensitive to vibration from changing the other bulb(s). Try this, on a fixture that has some bulbs that have been in there for a while, turn the lights off, unscrew the bulbs and screw them back in. I'll bet they start burning out soon after that.
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Yeah, I was gonna say.....
[Re: redk9258]
#350762 - 02/27/16 06:02 AM
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Cos I've long had fixtures with less than full set of bulbs and haven't had anything like that happen. Besides, as we're talking about basic electrical and very old lighting technology, you'd think that would've been in the culture from at least the 50s....but no that would'ntve washed, cos that would've been a hazard.
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