I want to help you guys achieve PERFECTION. Listen to me. My monitor is different than yours. What I see maybe different from what you see.  If not for yourself at least use the light meter for fans of your artwork.

Do this, go into photoshop and take every render you've done and load it.  Then click "auto contrast".  If you notice a lighting change it means you didn't use a light meter to properly light your scene.  If you don't notice a change in lighting it means you did a great job with lighting.

A lot of you are talented and have a GOOD eye, chances are you guys nail the lighting most of the time. But why not be 100% thorough?