LED in hermetic envelope?...

[John Larkin]

On Wed, 26 Apr 2023 14:04:42 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2023-04-26 10:45, John Larkin wrote:
On Wed, 26 Apr 2023 08:03:10 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2023-04-25 11:19, Clive Arthur wrote:
On 24/04/2023 16:28, Fred Bloggs wrote:

snip

\"Advanced cooling system provides for 25,000 hours of LED life.\"-
that\'s most likely a fairly high conductivity gas fill, like helium.
Air or vacuum is the absolute last thing anyone wants to use for LEDs.

https://www.earthtronics.com/product/300-lumen-a15-led-fan-small-globe-e26/


Heat removal is problematic in all the designs imitating an
incandescent filament.


Is liquid feasible?  I mean, fill the globe with liquid instead of gas.
Just don\'t drop it.


Sure, you can do a lot of cooling with drilling mud, for instance.
(As you know)


Weren\'t there some light bulbs filled with krypton or xenon or
something? And iodine.

Usually argon--it\'s cheaper. Xenon makes a nice bright white arc, of
course. Krypton is way too red-looking, iirc.

Cheers

Phil Hobbs

I meant incendescents.

 

[Phil Hobbs]

On 2023-04-26 17:01, John Larkin wrote:

On Wed, 26 Apr 2023 14:04:42 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2023-04-26 10:45, John Larkin wrote:
On Wed, 26 Apr 2023 08:03:10 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2023-04-25 11:19, Clive Arthur wrote:
On 24/04/2023 16:28, Fred Bloggs wrote:

snip

\"Advanced cooling system provides for 25,000 hours of LED life.\"-
that\'s most likely a fairly high conductivity gas fill, like helium.
Air or vacuum is the absolute last thing anyone wants to use for LEDs.

https://www.earthtronics.com/product/300-lumen-a15-led-fan-small-globe-e26/


Heat removal is problematic in all the designs imitating an
incandescent filament.


Is liquid feasible?  I mean, fill the globe with liquid instead of gas.
Just don\'t drop it.


Sure, you can do a lot of cooling with drilling mud, for instance.
(As you know)


Weren\'t there some light bulbs filled with krypton or xenon or
something? And iodine.

Usually argon--it\'s cheaper. Xenon makes a nice bright white arc, of
course. Krypton is way too red-looking, iirc.


I meant incendescents.

Sure--the ones with thin glass envelopes are all argon-only, and the
ones with small, thick quartz envelopes are all argon/iodine, AFAIK.

Krypton and xenon are far more expensive than argon, and no better for
incandescent lamps--if it don\'t react, it don\'t react.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[whit3rd]

On Wednesday, April 26, 2023 at 4:54:04 PM UTC-7, Phil Hobbs wrote:

On 2023-04-26 17:01, John Larkin wrote:
On Wed, 26 Apr 2023 14:04:42 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 2023-04-26 10:45, John Larkin wrote:

Weren\'t there some light bulbs filled with krypton or xenon or
something? And iodine.

I meant incendescents.

Sure--the ones with thin glass envelopes are all argon-only, and the
ones with small, thick quartz envelopes are all argon/iodine, AFAIK.

Krypton and xenon are far more expensive than argon, and no better for
incandescent lamps--if it don\'t react, it don\'t react.

There WERE krypton-fill lamps, for flashlights. The volume is small, but
the thermal conduction is small, too: that makes for longer battery life.
That fad didn\'t last, the quartz/halogen lamps were better for my bike light,
before LEDs took over all those items.

 

[piglet]

On 27/04/2023 8:36 am, whit3rd wrote:

On Wednesday, April 26, 2023 at 4:54:04 PM UTC-7, Phil Hobbs wrote:
On 2023-04-26 17:01, John Larkin wrote:
On Wed, 26 Apr 2023 14:04:42 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 2023-04-26 10:45, John Larkin wrote:

Weren\'t there some light bulbs filled with krypton or xenon or
something? And iodine.

I meant incendescents.

Sure--the ones with thin glass envelopes are all argon-only, and the
ones with small, thick quartz envelopes are all argon/iodine, AFAIK.

Krypton and xenon are far more expensive than argon, and no better for
incandescent lamps--if it don\'t react, it don\'t react.

There WERE krypton-fill lamps, for flashlights. The volume is small, but
the thermal conduction is small, too: that makes for longer battery life.
That fad didn\'t last, the quartz/halogen lamps were better for my bike light,
before LEDs took over all those items.

Yep, not just little flashlight bulbs. In 1950s-70s West Germany Osram
made filament bulbs with krypon (probably mixed with N2 or Ar) gas fill
boasting longer life. I have some little flashlight bulbs with Xenon
fill. The heavier gas pressure helps restore tungsten atoms to the
filament. All these have no halogens and are in regular glass envelopes.
Halogenated gas in quartz bulb permits running the filaments even hotter.

piglet