Define ‘professional’
A pro newsshooter exposes so the footage can be used without any effort. If that means he has to turn on his ugly on cam LED blaster, he will do so. He’ll grab a flashlight if needed.
A pro feature shooter lights the scene to his liking, and probably avoids outdoor shooting as ther is very little time where the conditions are all the same for all the shots needed.
So, if you can shoot the way you want it to look, do so. As Gary stated, do NOT use Log.
If you need to gain more than you want to avoid noise, you need lights.
If you want some extra light to make it better, by all means, do so.
It’s quite simple, if it looks good, it is good.
Getting the work done in time and put your effort where it belongs is really ‘professional’.
Bouke
http://www.videotoolshed.com