14 important parameters of LED chips part two

9. Perspective:

Refers to the maximum angle at which the LED emits light. Depending on the viewing angle, the application is also different, which is also called the light intensity angle.

10. Half shape:

The angle between the normal direction of 0° and the maximum luminous intensity value/2. Strictly speaking, it is the angle corresponding to the maximum luminous intensity value and the maximum luminous intensity value/2. The LED display module packaging technology causes the maximum luminous angle to be not the light intensity value of 0° in the normal direction, and the introduction of the deviation angle refers to the angle between the angle corresponding to the maximum luminous intensity and 0° in the normal direction.

11. The maximum forward direct current IFm:

The maximum forward DC current allowed. Exceeding this value can damage the diode.

12. Maximum reverse voltage VRm:

The maximum allowable reverse voltage is the breakdown voltage. Over this value, the LED may be damaged by breakdown.

13. Working environment topm:

The ambient temperature range in which the light-emitting diode can work normally. Below or above this temperature range, the light-emitting diode will not work normally and the efficiency will be greatly reduced.

14. Allowable power consumption Pm:

The maximum value of the product of the forward DC voltage and the current flowing through it that is allowed to be applied to both ends of the LED. If this value is exceeded, the LED will heat up and be damaged.