Time is going so fast , from we have develop APA102,APA104 RGB led , it is about one years , Nowadays ,our company have develop single color bulid in IC 5050 LED CHIP , it is 

APA102,APA104 White led ,  About the white color, it can be Warm white , Cool white , nature white , Pure white , it is just as same as RGB chanel, one led chip channel is 

WWW. there are some datasheet about them 

APA104 White LED datasheet

http://www.szledcolor.com/download/APA104 White LED.pdf

APA102 White LED datasheet 

http://www.szledcolor.com/download/APA102 White LED.pdf

           Nowadays we have use those led chip to make our addressable white led strip , and addressable RGB+W led strip , and it is very hot sales 

video of addressable white led strip  is on the following 

http://www.youtube.com/watch?v=RN_2nzSwf1w&feature=youtu.be