Now if you use Lithium AA batteries, which Brock has used in his Maglight with the 'super' lamp, these Li AAs are more expensive than normal Alkaline AAs.
I paid $11.22 for four L91 Energizer e2 Lithium AAs at Wal-Mart. They are well worth it.
You will not regret the advance to Lithium. The SureFire E1 & E2 are superb for carrying constantly, and are small enough to keep with you - hardly noticed until you need them.
The light output - beam quality; brightness and whitness are second to none.
Unlike other companies, when SureFire say a runtime, it's pretty much spot on for "constant-on" time-trials. This is useful high quality output.
Most Alkaline battery powered flashlights become increasily pathetic rather too quickly for my high demands.
For me, SureFire are the best.
Alastair