Crimson Trace CMR-204 Rail Master Pro
Green laser
100 lumen white light
If you're looking for a light, laser, both, or can't make up your mind...this is one that has worked flawlessly for me.
Where I got mine:
https://www.crimsontrace.com/products...
Left handed holsters, especially with lights or lasers mounted:
https://www.swaprigholsters.com/categ...
They make IWB holsters for the entire Crimson Trace line. Everything they make right handed, they also make left handed.
Flashlight on table is Olight I3T EOS
Handgun for testing is FNS 9 LS