I'm not an expert in LED, but I believe that with RGBW you never get a high output with the color white (so way less than the 800 Lumen) and the white color is never that good as the bulb will mix it with other colors.
(Unless they have different temperature white leds now inside the new bulb,
With the previous version I notist a tiny bit of green when set to white)
I prefer mainly white bulbs as my main lightning in the house, and use just a few RGB for color accents.
A good step forward from Yeelight that they made the new White Tunable available as the old White bulb did not have a warm white temperature.