Mac has made some EDC-sized lights in Titanium running an SST-50 on a high of 2.8A. (using an IMR cell)
By conventional wisdom, I would have thought it madness to run it on this high-level for more than a few seconds, however Mac stated that it could be run at this level for 10 minutes before throttling down.
I find this amazing but Mac is one of the most respected and gifted builders on CPF.
I think he has made quite a beefy Aluminium heatsink which is no doubt very closely in contact with the Titanium walls of the light.
This goes to show that the design of a good heat path is equally important to the choice of material and that the conception that Titanium is a poor choice of material is over-stated.
I believe the heatsink part is the reason why it can be done.
I'm thinking a nice copper sink would let you run the 50 even longer.
Still, I'm not sure why people would pick titanium aside from appearances.
The strength is a moot point. The force required to dent the aluminum body is significant and more than what you'd come by from day to day use. If you're in a situation where your light might be damaged in that manner, it's doubtful you'd expose your significantly more expensive titanium light to that danger.
Even for appearance, I find myself more attracted to the standard chrome plating if I wanted a self queen(which I don't).
I also think that Type III anodizing on aluminum would be more scratch resistant than bare titanium.
Again, I'm really thinking titanium's best trait is that it's called "titanium". The media has done an outstanding job of making this metal into some sort of mythical substance like adamantium.
I'm half convinced that declaring that my light is made of titanium would invoke as much shock and awe as displaying a 1000+ OTF lumen beam from a 1x18650 host. Some might expect the light to survive an explosion without ever knowing how far that is from the truth.
You know what would be really worth the extra money? A solid copper light with DLC coating. You could potentially drive an SST-90 to 9A for a few minutes in a small host that fits in your pocket.