
Sorry for the very late reply.
Actually, it is possible to customize the fixture, but the engineers will have to customize the source codes.
Also, as other engineers mentioned that this fixture can use and mix the four LED colors (rgbw) to light many different colors.
Thus, if White is not lit, you can make it lit using the combination of the RGB colors.
More importantly, several engineers tested to light CH3 (Master Dimmer), but all of them failed. They have no idea why it is not lit.
However, if you use 15CH mode, the same Channel is lit as expected. Please use the 15CH mode instead.