PS. What's the difference between P7 and T7, except slightly different design and price?
The only difference is the knurling pattern. The P7 has a square pattern, the T7 has a diamond pattern. Both have shallow knurling that isn't the greatest for grip... not as nice as the knurling on the Coast 7736 (older version, not the 7736TS that also has shallow knurling).
As far as runtime goes, Coast has always overstated them. Instead of listing useable runtime, they list how long the light will show a dim glow from the LED. For example, the 7438 will give a runtime of about 1:15 to 50%, then decline rapidly over the next half hour or so. After that, it settles into a dim glow that will last for days. Although it's a faint glow, you can still use it to find your way around a dark room... not too bad actually. BUT, I would list runtime as 2 hours or so. Coast is pretty accurate with their lumens ratings... it always puzzled me why they would go the "marketing" route with their runtimes. :shrug: