Good news , Nowadays , ws2812b black led chip is come out , it can use in black pcb led strip , black pcb led panel , which make it look more fit . 

and price is same as ws2812b white led chip , and have same function as ws2812b white , just color is different . it is very good to use in night club , 

Dj Room , Bar. the datasheet of it is on the following , you can have a look . thanks

WS2812B BLACK LED 

http://www.szledcolor.com/productshow.asp?id=935&sid=199