@larafale First, to be clear, it is NOT a bug and all three R, G, B, values (even with the 0) will properly light up your RGB LED. >Here is a post in another thread< with some code I wrote to allow the ZeRGBa to control a physical RGB LED, as well as feedback colour data to a Widget LED (simulated RGB) and three sliders/LEDs, one each for Red, Green and Blue.
By using the sliders you can also tweak the third value. However, it will also show how minimal a benefit that 3rd value generally is… in fact once past a few points, any additional value of the third number starts merging the RGB closer to simulated white you get by mixing all three colours.
PS, the search function on this page will really benefit you. That referenced post (and others related) showed up with just the word zeRGBa
