What are the misunderstandings when choosing LED panel lights?
As an energy-saving and environmentally friendly product, LED lighting has been accepted by more and more consumers, but most consumers lack understanding of LED and do not understand complex technical terms. What are the misunderstandings when choosing LED panel lights? How should we choose the LED panel light correctly? The LED panel light manufacturer Xiaobian will answer for you.
Misunderstanding 1, the expectation of the actual service life is too high.
LED manufacturers expect an LED lifetime of 100,000 hours MTBF (Mean Time Between Failure, the standard used by traditional luminaire manufacturers to measure light source lifetime). However, like all basic light sources, the luminous flux lumens of LEDs also decay over time. So while LEDs can last a long time, MTBF is not the only consideration in determining lifetime. The attenuation 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. What we should pay attention to when purchasing LED is its light decay speed, not usage time.
Misunderstanding 2, take 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 luminous intensity value is half of the axial intensity value and the included angle between the luminous axis (normal direction) and the luminous axis is the effective angle. 2 times the half-value angle is the viewing angle (or the half-power angle) is the actual light-emitting angle. Angles other than half of the axial intensity are not counted as effective angles in practical applications because the light is too weak. Therefore, we 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, and the effective light-emitting angle can be used as a reference value.
Misunderstanding 3, the higher 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 (for cylindrical light-emitting tubes, it refers to its axis), that is, the luminous flux emitted by a unit solid angle, and the unit is candle light (Candela, cd). Because the luminous intensity of general LEDs is small, the luminous intensity is often used as a unit of millicandela (mcd). Generally speaking, a light source emits its luminous flux with different intensities in different directions. The visible light radiation intensity emitted by a unit solid angle in a specific direction is called light intensity, or axial brightness for short.
The concept of electric power is introduced from the amount of work done by the force in the same time. The faster the current does the work, the larger the electric power; the slower the current does the work, the smaller the electric power. On the LED, it is not that the greater the power, the higher the brightness of the product. Taking Yimei's three{{0}}lamp red LED as an example, when the axial brightness is 1200mcd, the current is 40ma and the power is 0.48W; under the same brightness, the three-lamp white LED is 18ma and the power is only 0.24W; it can be seen that The power of the two kinds of light at the same brightness is different. So when we buy LEDs, we should pay attention to its axial brightness, not power.
Misunderstanding 4, about the purchase of white LED modules.
High-brightness (blue-green) white LEDs are very sensitive to static electricity, which is determined by the characteristics of the LED itself. Exceeding the maximum forward DC current and maximum reverse voltage it can allow may result in damage or breakdown of the LED. For example, in a three-lamp LED module, each lamp will have a resistor for anti-static, plus a resistor for current limiting, a total of four. The anti-static resistor can effectively suppress the damage caused by static electricity to the LED; the current limiting resistor mainly limits the amount of current passing through the entire module. This design can effectively improve the anti-overload capability of the LED and enhance product stability. At the same time, whether the four resistance signs are complete is also a sign that can easily identify whether the quality of the module is stable or not.
