Green LED I-V Curve...

On Tuesday, 21 July 2020 04:39:05 UTC+1, gray_wolf wrote:
On 20/07/2020 8:48 pm, Cydrome Leader wrote:
jlarkin@highlandsniptechnology.com wrote:

Blue seems to annoy people. As LEDs got better, we got complaints from
users, and had to reduce currents. The first blue LEDs, the SiC Crees,
were about right for a panel indicator at 50 mA. Now 1 mA is a bit
bright.

The original SiC Crees had a really nice light blue color too. I still
have one or two samples. They looked unique, like the 1970s or older era
deep red LEDs.


I was reading something the other day about the blue LEDs being harmful to humans.
Click to expand...

they are if you throw them hard enough.


NT
 
On Monday, 13 July 2020 02:16:12 UTC+1, George Herold wrote:

Yeah I recall something like that. Years ago there was a product that
used a bunch of the \'function generator\' ICs ICL8038.
Click to expand...

Evaluated one long ago - spawn of the devil. Distortion depended varyingly on waveform, frequency AND the distortion pot settings. If huge distortion is ok then go for it.


NT
 
On 2020-07-21, gray_wolf <g_wolf@howling_mad.com> wrote:
On 20/07/2020 8:48 pm, Cydrome Leader wrote:
jlarkin@highlandsniptechnology.com wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

Blue seems to annoy people. As LEDs got better, we got complaints from
users, and had to reduce currents. The first blue LEDs, the SiC Crees,
were about right for a panel indicator at 50 mA. Now 1 mA is a bit
bright.

The original SiC Crees had a really nice light blue color too. I still
have one or two samples. They looked unique, like the 1970s or older era
deep red LEDs.


I was reading something the other day about the blue LEDs being harmful to humans.
Click to expand...

I think it\'s all blue light, not just LEDs. When it activates the blue
cones in the retina the chemical reaction creates some sort of toxin.

https://phys.org/news/2018-08-chemists-blue.html

--
Jasen.
 
On 31/07/2020 11:58 pm, Jasen Betts wrote:
On 2020-07-21, gray_wolf <g_wolf@howling_mad.com> wrote:
On 20/07/2020 8:48 pm, Cydrome Leader wrote:
jlarkin@highlandsniptechnology.com wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:

jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.

It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.

Blue seems to annoy people. As LEDs got better, we got complaints from
users, and had to reduce currents. The first blue LEDs, the SiC Crees,
were about right for a panel indicator at 50 mA. Now 1 mA is a bit
bright.

The original SiC Crees had a really nice light blue color too. I still
have one or two samples. They looked unique, like the 1970s or older era
deep red LEDs.


I was reading something the other day about the blue LEDs being harmful to humans.

I think it\'s all blue light, not just LEDs. When it activates the blue
cones in the retina the chemical reaction creates some sort of toxin.

https://phys.org/news/2018-08-chemists-blue.html
Click to expand...

Thanks for the link!
 
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