This refers to the luminous angle of the LED elements on the LED light string. Generally, the luminous angle of the SMD LED, that is, the SMD element, is 120 degrees. The greater the luminous angle, the better the effect of astigmatism, but the relative brightness of the luminescence is correspondingly reduced. The light angle is small, the light intensity is up, but the irradiation range will be reduced. Therefore, another important indicator for evaluating LED strips is the angle of light emission. There are some bad manufacturers on the market. In order to increase the brightness of the light to earn higher profits, the light angle is intentionally reduced. If you are a little careless, you will buy such sub-charged components.