On Mon, 21 Mar 2016 10:30:03 -0700, DaveC wrote:

The LED in my flashlight is blinking (2/sec). It’s not the support
circuitry (constant current): the voltage across the LED is constant 4v. I
presume it’s a failure mode of the LED. It happens immediately upon
power-on.

http://imgur.com/a/rIRDG

The form-factor is close to a 5x5mm (h x diam). Standard through-hole leads.

But it’s a pretty high-intensity one. Don’t know what makes it so, but I
classify anything with a yellow square visible in the center as
“high-intensity”. Maybe not technically accurate, but there you are.

That's probably a downconversion phosphor. White LEDs are really blue
LEDs with a blob of epoxy on top, loaded with yag powder that converts
some of the blue to yellow.


--

John Larkin Highland Technology, Inc

lunatic fringe electronics