Bad LED dimmer

https://www.facebook.com/share/r/1MqEUa6oyN/

A bad design that for most control range LEDs are off, then there is some brightness control and then turn a little bit more and you have your LEDs fried. Trying to control LED brightness without series resistor by adjusting voltage going to then is a bad design. The LM317 should have been configured to adjustable constant source operation mode.

Here are some links to LM317 constant current drivers:
https://www.instructables.com/Super-simple-high-power-LED-driver/
https://www.electronicecircuits.com/electronic-circuits/lm317-constant-current-calculator/
https://www.ti.com/document-viewer/lit/html/SSZTC13
https://www.youtube.com/watch?v=t6nqd8_g5A8

Create a Simple LED Driver document at https://www.ti.com/document-viewer/lit/html/SSZTC13 gives some details

The LM317-N was the first adjustable voltage regulator, introduced way back in 1975. It’s still widely used in the industry as a constant voltage supply. But did you know that this device can do much more than regulate voltage? Its versatile architecture allows you to use it not just as a voltage regulator but also as a cool, constant-current LED driver.

Wait. Any linear regulator could be used for LED lighting with the addition of a current-limit resistor … what’s new with the LM317-N? Well, it’s actually not what’s new but what’s old that makes the LM317-N click as a simple LED driver.