Incident Light Meter - where to point it?

[george013]

I thought we were discussing the dome's light transmission, not "metering 101"?

You said "a light resistance, letting pass only 18% or something like that"

I said "the resistance to light is so as to match the sensitivity of the photo-sensor, not necessarily your 18% transmission"

George, is your post disagreeing with what I said?

I think we're saying the same. The sensitivity of the sensor is what the meter works with. And without anything in front of it, it's able to measure the reflective, light. So if you want to measure incident light you must cover it with something known so it can use the same formules to calculate the camera settings.
My thoughts.

George