I've worked with common anode and common cathode RGB LEDs either 12 volt or 5 volt using PWM mostly to change color. Usually then these products that I work with have the typical four color wiring where color may differ a little bit depending on being common anode or common cathode. I haven't yet worked with RGBW, but I think the white seems to make use of yellow wiring in most situations I've seen.
I often get products given to me that I eventually put to use. I received a light bar that I believe is RGB, but I don't know if its addressable. The person that gave it to me doesn't know where they got it from so they cannot look the product up to identify it or get tech specs for it. I'm puzzled as to what it is with the wire colors and markings inside the light bar.
I did take a 12 volt battery and hooked up black to negative and white to positive and got red led color. Other than that I'm unable to get any other color to reveal, but at this time I'm afraid I may burnout something through trial and error. I could not find any other markings on the strip's exterior or on the short wiring it came with either.
Inside the led bar I see markings where the wire is soldered to the LED strip. It shows GND, L, 12, and +12 from top to bottom. There is potting covering the solder connections so I can't make any positive identification of where the colored wiring is going. I've also never seen these labels before so I'm stumped!