A standard P60 from say, Solarforce, will do for your needs. The L2N and L2T seem to be favs around here and the prestigious Foy posts some wonderful reviews.
+1 for the Roche F8s from FT as above. There's a HUGE selection of driver ratings and LED tints to choose from to satisfy your specific need.
If you get a standard P60 host with a XP-G2 drop-in at 1.5amps on high you could run a full two hours with 400+lms otf with a good battery.