High-brightness LED (red, yellow, orange, blue color) to light only 1V ~ 2V, while the white LED light will be nearly around 3V.When the white LED in parallel with other colors, other turn earlier than the white color LED, resulting inVoltage drop, so that insufficient voltage white LED light show circuit will not come.
So when white and red LED in parallel, the red LED to add a larger series resistance, using sub-Compression theorem, so that white light is not substantially decrease the loop voltage.