High-power white LED (such as CREE's XML-T6) single power has reached 10W, voltage 3.3v current 3A, low-power red LED (such as common 5MM in-line) voltage 2v, current 15mA.

If you can't find the component model, you can infer the working voltage according to the light color:

Red light 1.8~2.2v, yellow light 2.0~2.4v, green light 2.2~2.8v, blue light and white light 2.8~3.5v.

The SMD package is a small power tube such as 0805 and 1206, and the working current is generally 10 mA, but there are exceptions;

The SMD package is 3014, 3528, 3535 and other small power tubes, and the working current is generally 20~50 mA, but there are exceptions;

The SMD package is 5050, 5060, 5630 and other medium power tubes, and the working current is generally 50~150 mA, but there are exceptions;

High-power LEDs are all SMD packages, and the parameters of different brands and series of different companies are very different; but the general working current of nominal 1W is 350mA.