suggestions for higher power white LEDs to testing?

On Aug 25, 11:40 am, Jon Kirwan <j...@infinitefactors.org> wrote:

snip

Anyway, open to good experiences.  Suppliers you've liked, as
well.  My temptation is to just buy only what I can find at
Digikey and do the order, that way.  But I know that may be
too limiting and so I'm pretty sure I will need to pick these
up from a variety of suppliers.

Thanks very much in advance,
Jon

Google up the youtube videos and sites and links
surrounding modding the Logitech G15 and G19
keyboards. They use an open source stage lighting
management program to individually address every
key's LED color and brightness.

Pretty cool keyboards too.
http://www.youtube.com/watch?v=5Wy5YKdbjZQ

Anyway, open to good experiences.  Suppliers you've liked, as
well.  My temptation is to just buy only what I can find at
Digikey and do the order, that way.  But I know that may be
too limiting and so I'm pretty sure I will need to pick these
up from a variety of suppliers.

Thanks very much in advance,
Jon

Jon Kirwan wrote:
On Thu, 26 Aug 2010 16:51:06 +0100, Eeyore
rabbitsfriendsandrelati...@removethishotmail.com> wrote:

Jon Kirwan wrote:
This is a game I play with students to show them what they
can do with junk and a little effort and knowledge.
Might be more useful to show them what they can do *without* using JUNK
! They might learn some REAL design skills.

I see you've never been a child.

I see you don't realise the disadvantages of use life-expired
components. I bought new parts for the vast majority of my hobby projects..

Graham

On Wed, 1 Sep 2010 12:05:16 -0700 (PDT), Nunya



jack_sheph...@cox.net> wrote:
On Aug 25, 11:40 am, Jon Kirwan <j...@infinitefactors.org> wrote:

snip

Anyway, open to good experiences.  Suppliers you've liked, as
well.  My temptation is to just buy only what I can find at
Digikey and do the order, that way.  But I know that may be
too limiting and so I'm pretty sure I will need to pick these
up from a variety of suppliers.

Thanks very much in advance,
Jon

 Google up the youtube videos and sites and links
surrounding modding the Logitech G15 and G19
keyboards.  They use an open source stage lighting
management program to individually address every
key's LED color and brightness.

 Pretty cool keyboards too.
http://www.youtube.com/watch?v=5Wy5YKdbjZQ

They have a hardware page at:
 http://www.g15-mod.com/e_hardw.htm

But it really looks to me like this is a special keyboard
with all the LEDs and drive circuitry already included when
you buy it.  I'm not sure what is being modded, except
perhaps some software?  I certainly do not see any schematics
there and the web site is ... well, terse.

Jon

Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.

Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.

On Sat, 28 Aug 2010 08:12:25 -0400, Ecnerwal
MyNameForward_at_ReplaceWithMyVices.Com.invalid> wrote:

Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.
Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.

That seems very good advice to remember. I'll keep it very
much in mind.

Ecnerwal wrote:
Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.

Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.

Absolutely right. As with any semiconductor device, operation at higher
temperatures reduces device life.

Eeyore wrote:

Ecnerwal wrote:
Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.

Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.

Absolutely right. As with any semiconductor device, operation at higher
temperatures reduces device life.


Higher than what? Talk about a overly broad, vague statement.

Grant wrote:

On Mon, 06 Sep 2010 12:51:38 -0400, "Michael A. Terrell" <mike.terrell_at_earthlink.net> wrote:


Eeyore wrote:

Ecnerwal wrote:
Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.

Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.

Absolutely right. As with any semiconductor device, operation at higher
temperatures reduces device life.


Higher than what? Talk about a overly broad, vague statement. :(

You could fall back on life halved for each 10'C temp rise? Vague, but
I've seen the idea expressed many times over the years.

Besides, we work with stuff that goes pop sometimes for no apparent reason.

Murphy lives! And that magic smoke is difficult to keep in place ;)


Grant, I've worked in places that the equipment was operated well
below zero. A 10° C increase would have made the equipment perform
better and not affect it's life enough to notice. The record low at
that location was -69°F and on windy winter days it could be below
freezing inside the control room.

I've also used equipment that had strip heaters & a thermostat to
maintain a minimum temperature to prevent condensation. That's why i
said it was a vague statement.

On Mon, 06 Sep 2010 23:20:24 -0400, "Michael A. Terrell" <mike.terrell_at_earthlink.net> wrote:


Grant wrote:

On Mon, 06 Sep 2010 12:51:38 -0400, "Michael A. Terrell" <mike.terrell_at_earthlink.net> wrote:


Eeyore wrote:

Ecnerwal wrote:
Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.

Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.

Absolutely right. As with any semiconductor device, operation at higher
temperatures reduces device life.


Higher than what? Talk about a overly broad, vague statement. :(

You could fall back on life halved for each 10'C temp rise? Vague, but
I've seen the idea expressed many times over the years.

Besides, we work with stuff that goes pop sometimes for no apparent reason.

Murphy lives! And that magic smoke is difficult to keep in place ;)


Grant, I've worked in places that the equipment was operated well
below zero. A 10° C increase would have made the equipment perform
better and not affect it's life enough to notice. The record low at
that location was -69°F and on windy winter days it could be below
freezing inside the control room.

Fair enough I don't live where it snows :)

I've also used equipment that had strip heaters & a thermostat to
maintain a minimum temperature to prevent condensation. That's why i
said it was a vague statement.

Once I worked for AU agents for Tenney environmental test chambers,
had to fix one where Tenney forgot to put in stainless fixings to
survive their own environments. Customer certainly not impressed
with the rusting heater assembly mounts.

Closest I've been to extreme electronics locales, at least it was in
boxes and not the control room

On Mon, 06 Sep 2010 12:51:38 -0400, "Michael A. Terrell" <mike.terrell_at_earthlink.net> wrote:

Eeyore wrote:
Ecnerwal wrote:
Which provides a definition for one point. It doesn't say
much about the different causes and the general picture or
what one might expect in some specific situation.
Well, as to specific causes, cooking is a big one. Pay a lot of
attention to cooling, and/or don't run at peak power. While it's nice to
get everything it's got to give, getting the heat out is a big issue
with the high power LEDs, and not getting the heat out is a major cause
of degradation at higher than expected rates.
Absolutely right. As with any semiconductor device, operation at higher
temperatures reduces device life.

Higher than what? Talk about a overly broad, vague statement. :(

You could fall back on life halved for each 10'C temp rise? Vague, but
I've seen the idea expressed many times over the years.

Besides, we work with stuff that goes pop sometimes for no apparent reason.

Murphy lives! And that magic smoke is difficult to keep in place ;)

Grant.

You're an idiot, again, as usual.