You can use incident meters to peg to the main light (point it at the sun) or to open shade (point it away from the sun) or whatever, but they don't discriminate about what tones they see and are most definately not keyed to the highlights. [...]
Luminance. This is the critical point that has been missing from the discourse. The values of individual tones (or luminance values) that make the scene and how incident/reflective have no way to differentiate those values. The solution is...?
.::Gary Rowan Higgins
A comfort zone is a wonderful place. But nothing ever grows there.