It’s actually quite simple with Philips Hue, there are three different types of light. Products classified as Hue White only have white LEDs with a fixed colour temperature. White Ambiance uses cool white and warm white LEDs to create different shades of white. With White and Color Ambiance, in addition to the white LEDs, there are also coloured RGB LEDs so that a total of 16 million colours can be mixed.
The Hue Festavia string light is actually just cheating No White and Colour Ambiance
No White and Colour Ambiance