Lots of info on google just type in led 5050. I use the 5050 strip lights and find them really good
The difference between SMD5050 and SMD3528 are :
1.SMD3528 inside package one light-emitting chip, while the SMD5050 inside package three light-emitting chip package.Therefore, theoretically SMD5050 three times the brightness than SMD3528,But usually not as that high.
2.SMD3528: The reason why it is called SMD3528 ,The dimension of this chip is 35mm * 28mm, power is 0.08W / Pearl
SMD5050: The reason why it is called SMD5050 ,The dimension of this chip is 50mm * 50, power is 0.24w/Pearl