Given the size, it looks like a 3-AAA light to me. (Personally I think that's a bad sign right away. Many of these offshore 3-AAAs use a cartridge for the batteries, which adds two more sets of spring-loaded contacts to the circuit -- more tiny, unrepairable bits to go wrong.)

But there's no way it's being run at 6 watts. What they actually mean is the LED itself is rated to a maximum of 6 watts. The circuit is almost certainly designed to run at half that or less. Truth in advertising -- hah!

You can buy a lot more flashlight for your money. A Fenix if you can afford it (pretty amazing spec's), or even a MagLED as a bright utility light.