一,Structure and properties of materials:

1,The size of chip. The same kind of chip, the larger the size, the higher the brightness, the stronger capacity, stable performance, the better, of course, price is also relatively higher. Chip size is now mainly: 9MIL, 10MIL, 12MIL, 14MIL and 23MIL so on.
2, The light emitting efficiency.LM emitted value from per watt is called luminous efficiency. This is an important standard to judge whether the energy-saving for LED. Incandescent lamp 14.4LM / W, fluorescent lamp is about 51LM/W, fluorescent lamp is about 51LM/W, the neon lights around 43LM/W, LED is up to 150LM/W, Note that only the white LED can reach such a high light efficiency, red, yellow, blue generally relatively low.
3,Service time. The LED service time everyone thinks is 100000H.In fact,the  LED product in 10 or 20 years before it can be up to 100000 hours, the best LED life is expected to only 50,000 hours by far. Incandescent 1000 hours, 2000 hours fluorescent, neon 10,000 hours. The so-called 100000 hours,but scientists in the laboratory at room temperature estimates obtained.due to differences in the package equipment used and production of technical differences and different management or different users…. the resulting in life is not the same. SMD LED, life can reach 40,000-50,000 hours; Piranha LED, life of 30,000 hours, in-line LED, life is 10,000 hours. Of course, with the chip and package technology progress these data will gradually improve. LED life is when the luminance of LED is 70% when the original brightness, we determine the LED life so far. LED life is when the LED luminous intensity is 70% of original brightness time, we determined that the LED life is over.
4,The quality of circuit board. LED of the same quality, the quality of the board will have an important impact on the life of the LED
The Circuit board is divided into aluminum, fiberglass panels, half glass plates, cardboard. The best quality aluminum plate, the best cooling effect, but the cost is too high, Follow, we will talk about Module, the color of piranhas, straw hat module is generally used cardboard or half glass, half glass patch series for general use or the glass plate. Colorful and full-color series have at least a half glass.
5,Full color range of IC . IC has dozens of different IC, the performance, stability and price are different, resulting in the finished product cost is different.
6,Solder：solder brightness is full, here is no cold solder joint, This affects the thermal and stability