10 3mm LED Knight Rider light Pro Mini?

30° viewing angle, 20mA
5 - 12VDC
15-20mA

That is not the way LEDs are normally characterised, you normally have a forward voltage drop at a specific current, like 3.2V @ 20mA. This is normally between 1.2V to 3.8V no higher.

What you posted implies it already has a resistor built in. Can you post a link to where you got them from please?