Wow, that that TLL is very cool. Just ordered one thanks to this thread.
I think you could make a little shroud that would keep it from blinding you. I might try my hand with some PVC.
I got the TLL when it came out, the idea is great, but the execution prevents it from getting as much use as it should.
Specifically: the ON function relies on the anodizing in the tailcap as an insulator, mine flashes ON as the cap is screwed on in a couple places so I know that the anodizing isn't perfect.
Other manufacturers get around this by removing the tailcap from the equation by putting a PCB inside the tailcap that makes contact between the end of the battery tube and the PCB. Doesn't matter if the ano gets worn. I have minimized the wear and spurious contact points by putting some thick grease on the threads.
Additionally the plastic diffuser dome is not an item offered as a replacement part in the event of breakage. This light is heavy, I suspect the dome wouldn't survive a drop on a hard surface. Hope I don't find out. A replacement kit with white and some other colors would be a great offering.
On the plus side: It works as advertised, is easy to swap emitters, has a handy 1/4-20 receiver on the butt end, and comes in a nice tube for protecting it in transport.
The lack of hotspot makes it nice for photography, we've used it camping - especially nice on the low mode, it also does well lighting up a room during a power outage if you place it up high and let the ceiling bounce light the room.