lampwin-led-12v

apa102c

sk6812b

btf-ws2812b

apa102-2020

https://www.youtube.com/watch?v=a2IY89FAjZE

https://www.richis-lab.de/Opto03.htm

https://www.richis-lab.de/Opto06.htm

https://www.eevblog.com/forum/projects/optoelectronics-die-pictures/

Open questions:

1. Why do red LEDs look so different than green / blue?
   1. DONE, see below
2. Size comparison in various modules?
   1. WIP below
3. Wire bonding unusual? Doesn't look like ball or bond
   1. Its standard ball bonding, except the ball is on the controller. Wedge was terminated on the LED instead of the package
4. What is the hexfet like pattern?

“Red is usually some kind of GaAs and so a vertical structure. Green and blue are GaN and so more lateral. Ok, not really lateral but the substrate is not conducting…”

Notes:

1. Coverslip (with oil, not water) made images much better for packaged LEDs with rough surface (see apa102-2020)
2. Infrared produced better images than optical for milky fill (see apa102c)