For outside views, I use only one infinite light and a modified BB's dome. There is only one sun, (I'v never seen a second one) :-)
Light always comes from above the horizon, and generaly at 30 to 60° above it.

IDL ( remember, light has to touch something to reflect from and create indirect light )

For inside views: The same, main lamps-lights are mostly above our heads.
Some like a candle can be below.

I use one or 2 spotlights, (mostly one for the main light source) and use an ambient on the secondary light sources. Only good if you again use IDL to render.

The relationship between light source and camera position is critical.

"BE" the lightbeam light. Think shadow.

In aviation, we call it "situational awareness". Know what is where, and what will happen in the future.

Poser8 and PoserPro2010 gave us IDL, and forced (in a good and constructive way) us to rethink light in a more realistic way.

Gloss-Blinn-Reflections - coming from secondary objects created more secondary "light" sources, that we did not have before IDL.

Is this not a facinating hobby??

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!