1. There are various models and specifications of LED lamp beads:

There are too many models of LED lamp beads, including direct plug and SMD type, and high-power lamp beads. The current of the lamp beads ranges from tens of milliamps to several amps, and the voltage is relatively consistent, most of which are at three o'clock. a few volts. There is no way to generalize.

Roughly speaking, according to the way of packaging, it can be divided into in-line, patch, and piranha, and according to the size of the power, it can be divided into large, medium and small power.

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.

Low-power in-line LED lamp beads are generally divided into models by diameter, 3mm, 4mm, 5mm, 8mm, 10mm and 12mm. Regardless of the diameter, its working voltage and working current are the same. Color can be divided into: red light