what are specifications of PWR led on arduino uno board

It’s a pretty generic green LED, 0805 package. Probably Vf is about 2.1V. It’s connected to V+ through two parallel 1k resistors (500ohms), for a current of about 6mA. Why do you ask?

Purists will curse that the arduino “reference” design contains very few detailed specifications of the parts. But that’s because it uses very generic parts!

thank . i want to build a shield . but when i measured smd led on arduino board it size is 1.5mm * 1mm