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1. Luminous intensity - the luminous flux emitted by a luminous body within a unit solid angle. That is, the density of the luminous flux produced by the luminous body in the spatially selected direction. The unit is one candela cd. The luminous intensity of light-emitting diodes usually refers to the luminous intensity in the direction of the normal (for cylindrical light-emitting tubes, it refers to its axis). If the radiation intensity in this direction is (1/683) W/sr. Then it emits 1 candela (symbol cd). Because the luminous intensity of general LED is small. Therefore, its luminous intensity is often used in candela (mcd) as a unit.
2. Luminous flux - the sum of the light emitted by the luminous body per second. Units—Lumens (LM).
3. Light efficiency - the luminous flux emitted by the light source divided by the power consumed by the light source. It is an important indicator to measure the energy saving of light source. Units—lumens per watt (lm/w)
4. Color rendering - the degree to which the light source presents the color of the object itself is called color rendering. That is, the fidelity of the color. The International Commission on Illumination (CIE) sets the color rendering index of the sun at 100. The color rendering index of various light sources is different.
5. Color temperature - expressed in absolute temperature K (K=℃+273.15). About to heat a black body, when the temperature rises to a certain level, the color gradually changes from dark red-light red-yellow-yellow-white-white-blue-white-blue. When a light source has the same color as the black body, we call the absolute temperature of the black body at that time as the color temperature of the light source. For example: when the black body is heated to appear dark red, the temperature is about 550°C, that is, the color temperature is 823K
6. Illuminance - the luminous flux of the luminous body on the unit area of the illuminated object, unit - lux (LUX)
7. Luminance - the brightness of a light source or an illuminated surface refers to the light intensity density of its unit surface in a certain direction, which can also be said to be the brightness of the light source or illuminated surface perceived by the human eye, unit: Candela per square meter (CD/
8. Brightness - the luminous flux of a luminous body in a unit solid angle unit area in a specific direction, unit: nit (nit)
9. Average lifespan - the time when the lamp is normally used and 50% damaged.
10. Glare - there are objects with extremely high brightness or strong brightness contrast in the field of vision, and the visual discomfort caused by it is called glare, and glare is an important factor affecting the quality of lighting.
11. Synchronization - two or more LED lights can operate normally in the way set by the program in an unspecified time. Generally refers to the internal control mode of LED lights, synchronization is the basic requirement for LED lights to achieve coordinated changes.
12. Protection level - IP protection level is to classify lamps according to their dustproof and moisture-proof characteristics. It consists of two numbers. The first number represents the level of lamps and lanterns that are dust-proof and prevent foreign objects from intrusion (points 0- 6), the second number represents the degree of moisture resistance of the lamp, and the sealing degree of waterproof intrusion (level 0-8). The larger the number, the higher the protection level.
13. Peak wavelength - the light emitted by the light-emitting diode is not a single wavelength, and the light intensity of a certain wavelength in the light emitted is the maximum, and this wavelength is the peak wavelength. Also called the dominant wavelength.
14. Half-value angle and viewing angle - refer to the angle between the direction where the luminous intensity value is half of the axial intensity value and the luminous axis (normal direction). 2 times the half-value angle is the viewing angle (or half-power angle).
15. Maximum forward DC current 1Fm---The maximum forward DC current allowed to be applied to both ends of the LED. Exceeding this value will damage the diode.
16. Forward working current lF---the forward current value of the light-emitting diode when the light-emitting diode emits light normally. In actual use, lF should be selected below 0.6* maximum forward DC current lFm