Thanks for the information. I'll stay away from the lithiums for sure. The design margin just isn't there for heatsinking.
By the way, the UPS guy just delivered my Reactor 3 a few minutes ago, so I took it out into my garage (dark there) and tried it out. I like it and the beam quality is pretty good, not excessively green.
I also bought an Inova X5T earlier this week. The Reactor is significantly brighter than the X5T but the smaller light fits the pocket better and its brightness and beam smoothness was quite good also.
What got me started on all this is that my brother gave me a Pelican L1 about two weeks ago and that woke me up to how much better the beam quality can be compared to everything else I had used in the past. After some websurfing I discovered CPF and the information here has been great and very helpful.
I've got a Streamlight Scorpion coming tomorrow, for when I need more throw and brightness.
So, with a Pelican L1, Inova X5T, Reactor 3, and a Scorpion, I think most of my needs will be met.
Phil