1. Forward working current If:

It refers to the forward current value of the light-emitting diode when it normally emits light. In actual use, you should choose IF below 0.6·IFm according to your needs.

2. Forward working voltage VF:

The operating voltage given in the parameter table is obtained under a given forward current. It is generally measured when IF=20mA. The forward working voltage VF of the light-emitting diode is 1.4～3V. When the outside temperature rises, VF will drop.

3. V-I characteristics:

The relationship between the voltage and current of the light-emitting diode. When the forward voltage is less than a certain value (called the threshold), the current is extremely small and no light is emitted. When the voltage exceeds a certain value, the forward current increases rapidly with the voltage, and light is emitted.

4. Luminous intensity IV:

The luminous intensity of a light-emitting diode usually refers to the luminous intensity in the direction of the normal line (for a cylindrical luminous tube, its axis). If the radiation intensity in this direction is (1/683) W/sr, it emits 1 candela (symbol is cd). Since the general LED has a low luminous intensity, the luminous intensity is usually used as the unit of candlelight (candela, mcd).

5. The light-emitting angle of the LED:

-90°- +90°

6.Spectral half-width Δλ:

It represents the spectral purity of the luminous tube.

7. Half-value angle θ1/2 and viewing angle:

θ1/2 refers to the angle between the direction where the luminous intensity value is half of the axial intensity value and the luminous axis (normal direction).

8. Full form:

The angle calculated according to the solid angle of the LED light is also called the plane angle.

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 packaging technology causes the maximum luminous angle to be not the light intensity value of 0° in the normal direction. 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. 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. High energy saving: constant voltage DC drive, the same lighting effect can save more than 80% than traditional energy-saving light sources, which can produce huge economic benefits.

Long life: LED lamp is also called never extinguished lamp, solid cold light source, epoxy resin encapsulation, the lamp body has no loose parts, no filament burnout, heat sink, light decay and other shortcomings, and the service life is as long as 5W-10W Hour.

Environmental protection: The lamp does not contain mercury and other toxic heavy metal pollutants. Traditional fluorescent lamps contain mercury. Take a 26mm (T8) fluorescent lamp as an example, which contains 20mg of mercury. Once it breaks and volatilizes into the air, it will cause poisoning. There is no infrared and ultraviolet radiation in the spectrum, no flicker, waste and recyclable, low heat, it is a typical green light source, no mosquitoes around the lamp body at night, so that the indoor lighting environment is cleaner, hygienic and tidy.

High color rendering index: The color rendering index of LED lighting is as high as 80, the color rendering index of fluorescent lamps is 65-80, and the color rendering index of incandescent lamps is 95.

High luminous efficiency: Taking LED fluorescent lamps as an example, the luminous efficiency of ordinary fluorescent lamps is 55-80lm/W, while the luminous efficiency of LED fluorescent lamps is above 100lm/W, and some manufacturers can achieve above 130lm/W, according to the current development trend It seems that it is still improving.

High lamp efficiency: Lamp efficiency mainly refers to effective light efficiency. The traditional fluorescent lamp emits light in 360 degrees, and the light in the opposite direction is useless. Therefore, the fluorescent lamp uses a white lampshade to reflect the light in the opposite direction. The efficiency of the traditional fluorescent lamp is usually only 70%. The light-emitting angle of the LED fluorescent lamp is usually 120 degrees, which can be adjusted according to needs, and the effective light efficiency is higher than that of traditional lamps.

High power supply efficiency: The power supply not only provides drivers for the lamps, but also has the difference between isolated and non-isolated power supplies. The efficiency of the power supply will affect the efficiency of the entire lamp. The service life of the power supply also directly affects the service life of the LED lamps. The power factor of the power supply can reach 0.9 The power factor of the above traditional lamps is usually lower than 0.512, and the efficiency of the power supply lamps is 0.5 times that of the traditional lamps.

Supporting investment is small: LED lamps can achieve 5 times the effect of traditional lamps with extremely small power, easy to install, no rectifier, required wire specifications are far lower than the current level, long life and repairable at the same time, and the maintenance amount is much less than traditional lamps.

Strong customization: LED light source can use the principle of three primary colors of red, green and blue. The three colors have 256 gray levels and can be mixed arbitrarily. The color temperature range is wide. The color temperature is related to the color characteristics of LED lighting products. In theory, it can provide any color temperature. Generally, the light with the color temperature below 3300K on the market is warm and stable. The refreshing light in the middle of 3000-5000K and the cold feeling light with the color temperature above 5000K are the main ones, which can achieve colorful dynamic changes.