LED light source misunderstanding one, the expectation of the actual service life is too high
LED manufacturers expect LED life to reach 100,000 hours MTBF (Mean Time Between Failure, the standard used by traditional lamp manufacturers to measure the life of light sources). However, like all basic light sources, the luminous flux of the LED decays over time. Therefore, although LED light-emitting time can be very long, MTBF is not the only consideration in determining the service life. The decay of LED lumens is affected by many environmental conditions such as ambient temperature, humidity and ventilation. Lumen decay is also affected by control, thermal management, current levels, and many other electrical design considerations.
Many salespersons may provide some vague information to customers for some reason when promoting LEDs, which may cause misleading. For example, the service life of LEDs is about 100,000 hours. The 100,000 hours here refers to the expected service life of LEDs by the manufacturer. But as the light source of lighting, the brightness of the lamp has a process of gradual attenuation and dimming (such as fluorescent lamps, energy-saving lamps), which is referred to as light decay. Therefore, consumers should pay attention to its light decay speed when purchasing LEDs, not the use time. Consumers must not expect too much of the actual service life.
LED light source misunderstanding two, regard the actual light-emitting angle as the effective angle
The light-emitting angle of LED is divided into effective angle and actual light-emitting angle. The angle between the direction where the luminous intensity value is half of the axial intensity value and the luminous axis (normal) is the effective angle. The viewing angle (or half-power angle) twice the half-value angle is the actual light-emitting angle. Angles other than half of the axial intensity are not included in the effective angle in practical applications because the light is too weak.
Therefore, consumers should pay attention to the actual light-emitting angle of the product when purchasing products. When calculating the number of products used in the project, the actual light-emitting angle shall prevail. The effective light-emitting angle can only be used as a reference value. LED side light source LED injection module LED light bar LED waterproof glue filling module Hongyan cab Sany cab Sany Heavy Industry Parts
LED light source misunderstanding three, the greater the power, the higher the brightness
The brightness of LED is measured by luminous intensity. The luminous intensity refers to the luminous intensity in the direction of the normal line (for a cylindrical luminous tube, its axis), that is, the luminous flux emitted per unit solid angle, and the unit is candlelight (Candela, cd). Since the luminous intensity of general LEDs is small, millicandela (mcd) is commonly used as the unit of luminous intensity. Generally speaking, a light source emits its luminous flux with different intensities in different directions. The intensity of visible light emitted per unit solid angle in a specific direction is called light intensity, or axial brightness for short.
Introducing the concept of electric power from the amount of work done by the force in the same time, the faster the current does work, the greater the electric power; the slower the current does, the smaller the electric power, or in the same time, the more work the current does, the greater the electric power. On the LED, it is not that the greater the power, the higher the brightness of the product. Take the three-lamp red LED of Yimei Electronics as an example, when the axial brightness is 1200mcd, the current is 40ma and the power is 0.48W; under the same brightness, the current is 18ma and the power is only 0.24W; it can be seen The power of the two kinds of light is different under the same brightness. Therefore, consumers should pay attention to its axial brightness, not power, when purchasing LED lamps.
