There are many types and specifications of LED lamp beads: there are too many models of LED lamp beads, including in-line and SMD type, as well as high-power lamp beads. The current of the lamp beads ranges from tens of milliamps to several amps. It's more consistent, mostly at 3:00 volts. There is no way to generalize. Roughly speaking, according to the package, it is divided into in-line, patch, and piranha. According to the power, it is divided into large, medium and small power high-power white LEDs. The power of a single machine has reached 10W, the voltage is 3.3v, and the current is 3A. For example, the common 5MM in-line) voltage is 2v, and the current is 15mA. If you can't find the component model, you can infer the working voltage according to the color of the lamp: 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 SMD package is 0805, 1206 and other small Power tube, the working current is generally 10 mA, but there are exceptions; mA, but there are exceptions; SMD package is 5050, 5060, 5630 and other medium power tubes, the working current is generally 50~150mA, but there are exceptions; high-power LED They are all SMD packages, and each company's brand is different, the series is different, and the parameters are also very different; but the nominal 1W general working current is 350mA low-power in-line LED lamp beads are generally divided into models by diameter, 3mm 4mm 5mm 8mm 10mm 12mm Regardless of the diameter, its working voltage and working current are the same color: red light yellow light 1.7--2.1V white light blue light warm white light pink light purple light 2.8--3.6V green light 2.6--3.4V LED lamp beads have various specifications 1. 0.06W, voltage 2.5-3.5 V, current is 20mA. 2. 0.5W, voltage 2.5-3.77V, current 150mA. 3. 1W, voltage 2.79-3.99V, current 350mA. 4. 3W, voltage 3.05-4.47V, current 700mA. 5. 5W, voltage 3.16-4.88V, current 1000mA. The current of the lamp bead 1W: 320-350mA, the selected driver is generally 300mA current, and the chip size is 30mil, 35mil, 40mil, 45mil. The current of the lamp bead 3W: 700mA, the drive is generally 600mA, and the chip size is 45mil. 1W 3W voltage is between 3.0-3.6V, 3.2-3.4V is better. As for a single 5W chip, our company has not produced it yet, so we don't know the specific parameters. The chip is generally more than 50mil. The LED lamp beads generally used for lighting are from 0.5w-5w, and the working voltage is about 3-3.2V. What are the parameters of white LED 1 watt lamp beads, we generally design 3.6---4.2V, 0.2---0.3A. There are many 15W lamp beads now, you can refer to them. Such as cree mce, cree t6. Voltage: 3.2-3.6v, current 300-350ma, luminous flux: 100-120 lumens, color temperature: white light 6000-7000K Time brightness, the higher the better. 2. Look at the brand and size of the chip. Brands include NICHIA, CREE, Purui, Xuming, Jingyuan, New Century, etc. The higher the chip, the better. The bigger the chip, the better. 3. Look at the sub-BIN, that is, the color temperature division and the voltage sub-BIN, the finer the better. 4. To see the attenuation, you need to do an aging test. The lower the light attenuation, the better. 5. Look at the actual application, such as: there are suitable and cheap lenses and aluminum substrates on the market. If you need to open the lens and aluminum substrate, the investment will be relatively large, 1W high power, current: 350ma, voltage: 2.8-4.0V brightness: 80-130LM color temperature: 3000-12000K.