误区一，对实践运用寿数的希望过高
A misunderstanding, the practice of using his hopes too high.
LED制造商预期LED寿数到达100,000小时 MTBF (均匀无故障时刻，传统灯具制造商运用的丈量光源寿数的规范)。可是，就像所有根本光源相同，LED的光通量流明也跟着时刻而衰减。所以，尽管LED发光时刻能够很长，MTBF不是确定运用寿数的仅有思考。LED流明的衰减受到许多环境条件如环境温度、湿度和通风的影响。流明衰减还受到操控、热学管理、电流水平缓许多其它电气设计思考的影响。
LED LED is expected to reach 100000 hours old manufacturer MTBF (standard uniform no fault time, measuring light source lamp manufacturers use the traditional life). However, as with all the fundamental light sources, the LED luminous flux is also attenuated with time. So, although LED led to a long time, MTBF is not only determined by using the thinking of life. LED lumen attenuation is affected by many environmental conditions such as ambient temperature, humidity and ventilation. Lumen attenuation is also affected by many other electrical design considerations such as manipulation, thermal management, and current levels.
许多业务员在推销LED时出于某种原因可能给客户供给一些含糊信息，形成误导，例如LED的运用寿数在10万小时左右，这儿的10万小时是指制造商预期 LED的运用寿数。但作为照明的光源，灯的亮度有一个逐步衰减变暗的进程(如日光灯，节能灯)，这一进程简称光衰。所以，消费者在选购LED时要重视的是它的光衰速度，而不是运用时刻，消费者切莫对实践运用寿数的希望过高。
Many sales clerk in the LED for some reason may give customers some vague information, such as the formation of misleading, the use of LED days in 100 thousand hours, 100 thousand hours here refers to the use of LED manufacturers expected life. But as the lighting of the light source, the brightness of the lamp has a gradual decay of dark process (such as fluorescent lamps, energy-saving lamps, this process is referred to as light). Therefore, consumers should pay attention to in the purchase of LED when it is light speed, instead of using time, consumers not to practice his hopes too high.
误区二，把实践发光视点当成有用视点
Error two, the practice of luminous point of view as a useful point of view
LED的发光视点分为有用视点和实践发光视点。发光强度值为轴向强度值一半的方向与发光轴向(法向)的夹角为有用视点。半值角的2倍为视角(或称半功率角)是实践发光视点。在轴向强度一半以外的视点因为光线太弱在实践使用中不计入有用视点。
LED luminous point of view is divided into useful point of view and practical lighting. The angle between the direction of the luminous intensity value of the axial intensity value and the direction of the luminous axial (normal) is useful. Half of the value of 2 times as the angle of view (or half power angle) is the practice of luminous point of view. In the view of half of the axial intensity, the light is too weak to be used in practical use.
因此，消费者在选购商品时应当重视商品的实践发光视点，核算工程中所用商品数量时，以实践发光视点为准，有用发光视点只能够作为参考值。
Therefore, consumers should pay attention to the purchase of goods in the light of the practical point of view, accounting for the number of goods used in the project, in order to practice the luminous point of view prevail, useful luminous point of view can only be used as a reference value.
误区三，功率越大亮度越高
Error three, the greater the power, the higher the brightness
LED的亮度用发光强度来衡量，发光强度是指法线(对圆柱形发光管是指其轴线)方向上的发光强度，即单位立体角所发射出的光通量，单位为烛光(Candela, cd)。因为一般LED的发光强度小，所以发光强度常用毫坎德拉(mcd)作单位。一般来说，光源会向不一样方向以不一样强度放射出其光通量，在特定方向单位立体角所放出之可见光辐射强度即称之为光强度，简称轴向亮度。
The brightness of the LED used to measure the luminous intensity, luminous intensity is fingering (of cylindrical luminous tube line refers to its axis) direction of the luminous intensity, luminous flux per unit solid angle emitted, the candle unit (Candela, CD). Because of the general LED luminous intensity is small, so the luminous intensity of commonly used Candela (MCD) as a unit. In general, the light source will not be in the same direction as the intensity of the radiation emitted by its luminous flux, in the specific direction of the unit of solid angle emitted by the visible light radiation intensity known as the light intensity, referred to as axial brightness.
从力在持平时刻内做功的多少引进电功率的概念，电流做功快，电功率就大;电流做功慢，电功率就小，或说在持平的时刻内，电流做的功越多，电功率就越大，在LED上，并不是功率越大，商品亮度就越高。以宜美电子的三灯赤色LED为例，轴向亮度为1200mcd时，电流是40ma，功率为0.48W;三灯白色LED在平等亮度下，电流是18ma，功率仅为0.24W;能够看出二种光在平等亮度下的功率是不一样的。所以，消费者在选购LED灯具时要重视的是它的轴向亮度，而不是功率。
How to introduce electric power from the concept of force acting in the same time, current work fast, electric power is large; current work is slow, the electrical power is small, or in the same time, more power current, electric power is greater, in the LED, and not the greater the power, the commodity the higher brightness. The three red LED lamp should be beautiful electron as an example, the axial brightness is 1200mcd, the current is 40mA, power is 0.48W; three light white LED in equal brightness, current is 18ma, power is only 0.24W; can be seen two kinds of light in equal brightness under the power is not the same. Therefore, consumers should pay attention to the purchase of LED lamps is its axial brightness, rather than power.

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