I was fortunate enough to have the opportunity to take the Low Light CQB Carbine (NightFighter 101) course with Viking Tactics. Kyle Lamb and Chili Palmer of Viking Tactics are amazing instructors. This particular class was held at the Sig Sauer Academy in New Hampshire.
NightFighter 101 was set up in a crawl, walk, run fashion. Granted there are pre-requisites and you need in order to be safe and competent in your weapon handling skills out the gate, but the class ramped up. Starting with simple up-drills working on light manipulation and eventually advancing to shooting from and around vehicles, all in the dark using weapon mounted lights.
I would take this course by Viking Tactics again in a heartbeat. A great training environment with top tier instructors.