I am still rather new to this, but not all Starvis sensors are Starlight.
I look at camers specs for minimum illumination.
For Dahua Starlight you typically see specs like this:
0.009Lux/F2.0( Color,1/3s,30IRE)
0.07Lux/2.0( Color,1/30s,30IRE)
0Lux/F2.0(IR on)
For Dahua non-Starlight Starvis...