I do think 1200 lumens on 2 x CR123A's is pushing it but, people need to quit being babies. Surefire is an American company that tailors to mainly professional users(LEO, MIL, Security, Government Contractors, etc.) and also probably doesn't want to get sued so, I am sure they thoroughly test all their products. Not to mention they have decades of R&D and experience(much more then most flashlight companies). Also, how many stories have people heard of EDCL2-T's or Defenders blowing up? I personally have read none.
High power lights get got, as do their batteries. Most CR123A's are rated to at least 60C. 60C is very hot. That is 140F for you US folk. And, I am sure there is a generous safety buffer built into those specs. Not to mention most lights have either a timed step down or thermal regulation to prevent overheating.
So, use your lights people, you are taking far more risks with other things by leaving your house every day.