The goods never arrived & unfortunately Aliexpress could not understand the details of the dispute .
Arrival in 8 days, quick delivery. Three RGB light emitting elements are enclosed in one LED chip, and the colors are mixed well. There is no white element. It is not possible to change the color individually, and all chips emit light with the same color. Very bright in 5050 size. The base flexible PCB feels a little harder and thicker than other products. The limiting resistance of each of RGB is 150, 100, 100 ohms. The static current consumption per 300 chips was 690, 520, 540 mA. The total current consumption is 1750 mA, but less if it is driven by PWM. It is desirable to use a power supply of 5V3A or more. It is a very good product suitable for backlight lighting. Thank you.