直下式平板灯相关于侧发光平板灯有以下几点优势：榜首，能效高。LED 宣布的光经扩散板直接照耀出来，提高了灯具的系统能效。据报道，现在已有80lm/W 以上的产品。第二，本钱较低。省去导光板的本钱，使得灯具的本钱下降，内部空间大了，规划也愈加的灵活。第三，灯具质量减轻，因为省去了导光板。第四，可靠性添加。我们知道，在灯具规划中，各个元器件及所用资料的功能将决议灯具产品的功能，元件添加，可靠功能下降。所以假如使用质量较好的扩散板，灯具即可保证较长的寿数，而导光板及反射膜在高的温度下，易老化变黄，影响出光功率和使用寿数。
Compared with the side light-emitting flat lamp, the straight down flat lamp has the following advantages: top of the list and high energy efficiency. The light announced by the LED shines directly through the diffuser, which improves the system energy efficiency of the lamp. It is reported that there are more than 80lm / W products. Second, the cost is low. Save the cost of light guide plate, reduce the cost of lamps, increase the internal space and make the planning more flexible. Third, the quality of lamps is reduced because the light guide plate is omitted. Fourth, reliability is added. We know that in the planning of lamps and lanterns, the functions of various components and materials will determine the functions of lamps and lanterns, the addition of components and the decline of reliable functions. Therefore, if the diffusion plate with good quality is used, the lamp can ensure a long service life, and the light guide plate and reflective film are easy to age and turn yellow at high temperature, affecting the light output power and service life.
The main deficiency of straight down flat panel lamp is that it can not be too thin. There must be a certain distance between the LED light source and the diffuser, otherwise the lamp will have bright spots, which will inevitably lead to the increase of the thickness of the lamp, so that the cost of the lamp shell will be added, and the appearance of the lamp will be poor. Moreover, the increase of the thickness will increase the light transmission path and reduce the energy efficiency of the lamp. Because the lamp beads are fixed on the back plate, if the back plate uses the whole aluminum substrate, the cost will be very high. If the strip aluminum substrate is used, fixing and positioning are another problem. If the back plate of the straight down flat lamp uses a large aluminum plate, it should also consider the deformation and twists of the back plate during long-time hoisting.
侧式平板灯的缺少首要为：榜首，能效不容易做的很高。表 1 给出了相同功率的侧入式LED 平板筒灯与传统LED 筒灯功能的一个比较。从剖析上能够看出，相同功率下侧入式LED教室面板灯在光输出、能效及显色指数(CRI)等功能目标上与传统LED 筒灯比较仍有不小的差距。第二，本钱价格较高。导光板是侧入式平板灯的中心;因添加了导光板，价格比直下式要高;第三，对导光板质量要求较高，假如规划不好，会呈现中间亮，两边暗，或进光边有亮边，或不同视点亮度不一致等现象，影响照明质量。第四，可靠功能相对较差。因为侧发光平板灯中的导光板、反光油墨和反射膜一直处在比较高的温度下，很容易老化变黄，致使出光率下降，灯具寿数大打折扣。
The main reason for the lack of side flat panel lamps is: the top of the list, energy efficiency is not easy to do, and it is very high. Table 1 shows a comparison between the functions of side entry LED flat downlight with the same power and traditional LED downlight. From the analysis, it can be seen that there is still a big gap between the side entry led classroom panel lamp with the same power and the traditional LED downlight in terms of light output, energy efficiency and color rendering index (CRI). Second, the cost price is high. The light guide plate is the center of the side entry flat panel lamp; Due to the addition of light guide plate, the price is higher than the straight down type; Third, the quality requirements for the light guide plate are high. If the planning is not good, it will appear that the middle is bright, both sides are dark, or there are bright edges at the light inlet edge, or the brightness of different viewpoints is inconsistent, which will affect the lighting quality. Fourth, the reliable function is relatively poor. Because the light guide plate, reflective ink and reflective film in the side light-emitting flat lamp are always at a relatively high temperature, it is easy to age and turn yellow, resulting in a decrease in luminous output and a significant reduction in the service life of the lamp.