国产小说区视频区_中文字幕日韩一区二区三区免费_在线日韩一区三区_國產歐美日產一區二區三區人妖_q色婷婷色综合激情国产日韩_午夜成人亚洲理论片在线观看_日韩欧美另类福利_国产美女裸身网站_成人国产蜜臀AV片毛片_久久夜色精品网站

There are three main light sources on the LED fluorescent tube: one is to select multiple medium and small power LEDs, such as 3528, 2835, 3014, 5050 and other LEDs below 1W; The second is to select several high-power light beads with a power of 1 ~ 3W LED; The third is to select an integrated light source, that is, the so-called cob light source. The three different light sources have their own advantages and disadvantages.

Small and medium power LED is selected as the light source of downlight. Due to the large number of LEDs, it can cover the whole light source cavity as much as possible, which can make the heat transformed during led operation spread more widely, facilitate heat dissipation, and prevent local temperature overheating. Similarly, due to the lax distribution of LEDs, the distance from the light source to the light emitting surface can be planned to be relatively small, so the function of uniform light spot can be achieved. Therefore, selecting low-power LED as downlight can plan the height of downlight relatively low. There are also deficiencies in the selection of small and medium-power led, mainly reflected in the cost. As the low-power led requires the circuit board for electrical connection, generally considering the heat dissipation requirements, aluminum substrate is selected for electrical connection. There are a large number of low-power LEDs, and it is also necessary to select a mounter to paste the LEDs on the aluminum substrate. These two aspects increase the cost of the whole lamp.

The LED of the integrated light source is selected as the light source of the downlight. Because the integrated light source has its own circuit board, it only needs to be fixed in use, so the relatively low-power led saves the cost of the aluminum substrate and the cost of the patch. However, the use of integrated light source in downlight will also have several deficiencies. First, due to the relatively large power of integrated light source and the relatively concentrated heat source during led operation, the requirements for heat dissipation planning are higher; Second, the light emitting surface of the integrated light source is relatively small. In order to prevent light spots on the light emitting surface of the downlight, it is generally required that the distance from the integrated light source to the light emitting surface is relatively large, which requires the height of the reflector to be relatively high. Therefore, the downlight with integrated light source will be relatively high, and the volume of the whole lamp will be naturally large.

Article from: LED fluorescent tube manufacturer http://mushuren.cn