AR Lighting and Shadows

I finally got light-estimation somehow working in 4.19 but what’s the correct way using it ?
I just use the ambient-lumens-intensity and pipe it into my directional-light intensity and also into the intensity of the skylight.

But as the output is lumens my lights are way to bright, so i just hackished “divided” the value to decrease the intensity.
How f.e. can i use the ambient-color in my scene, right now i use it in the directional-light, but should´nd it be used in the skylight ?

Can we change the directional-light to lumens ? The point-light f.e. has an option for it.