In general, core inside the tube determines its light source is good or bad quality. The common first-tier brands are CREE, Osram, HP, Nichia and so on, but most of them in the market are imitated, and it is hard to tell the difference. For second-tier brands, there are Epistar, Huga, ChiMei, GenesisiPhotonics, and Tekcore etc, and they are currently the relatively common and cost-effective choices for customers. The core size is a reference factor to judge the quality is good or bad. Generally we think the bigger, the more expensive, and the quality is better.
2. The current market situation
Currently, there are a variety of common specifications such as 3528, 2835, 3020 and 3014 etc in the market, and 3014 is the light source which is used by most people, but its cost performance is not good actually. As we all know, the wattage of 3528 is 0.0625W/pc, and it can operate below an estimated 20mA, which belongs to small power light source; The wattage of 3014 is 0.1w, and it requires 30mA to operate, which belongs to small and medium power light source. Such small and medium power core is relatively expansive, which will increase the production cost largely, so it is not suggested to choose 3014 as the light source.
3. Materials and structure
In materials, LED tubes can be devided into semi-plastic and semi-aluminum tube and all plastic tube. The early LED fluorescent lamp uses all plastic tube, and the non-isolationg power sully can avoid electric shock problem. The biggest problem of LED fluorescent lamp is heat dissipation problem. Heat is sealed in the tube totally and unable to dissipate, which leads to high brightness decay, so it is not suggested to use. The LED fluorescent lamps sold currently use semi-plastic and semi-aluminum almostly. The transmitting side uses plastic, and dissipation side uses aluminium alloy. The power supply is inside the aluminum tube. The power of such tube is around 20w, and the standard of dissipation effect is 1.0MM, which determined by the thickness of the aluminum tube.
There are some other factors that can influence the quality of LED tube, which includes the fixed end, light transmittance of PC cover and the base plate. Same as the main materials of LED tubes, the connection end can also use aluminum, PC or aluminum and pc. It can be fixed at both sides of the tube with glue or screw. The screw type is welcomed by general customers for the safe and environmental protection aspects. The light transmittance of the transparent cover can reach 88% to 95%, and that of damascene cover ranges from 70% to 86%. It is mainly determined by the materials. There are ordinary PC material and pmma pc material, and the light transmittance of PC cover produced by different manufacturers may differ greatly. Finally several sentences on the base plate, at present LED cores are sticked on the PCB or aluminium base electronic circuit board by a certain patterm, and then fixed to the aluminium alloy radiator. The thermal conductivity of glass-fiber PCB is 20w/mk, and that of aluminium alloy is 200w/mk. The larger, the better.
This article comes from http://www.yourlite.com/news/35706.html
