1, chips used for LED strips：chips come from China, Taiwan, and overseas, including USA, Japan, Germany. The prices differ a lot. USA chips is the most expensive ones, the second is Japan ones and Germany ones.
2、LED packaging：including resin and silicon, resin packaging is cheaper, but heat inside is hard to be out, the rest performances will be the same. Silicon packaging is better, and the prices will be higher.
3、color of LED：there are many led packaging factories in China, some of them are good, some of them are not so good, some of them even do not have the machine to separate the LED by color, so the quality can not be guranteed.
4、soldering technology：led strips can be soldered by hand or by machine.
Soldering by hand can not gurantee the quality, SMD machine is better.
6、FPC certified or not: some of them certified by UL, of course the price is expensive. Some of them do not have any certificates, cheaper.
7、LED brightness：different LED has different brightness. Prices are also different.
8、LED color：green and white is a little expensive, red,yellow and blue is cheaper.
9、LED size：such 5050 led strips is expensive than 3528 led strips