http://www.light-reviews.com/uf_c3_5mode/
Is this the same light? How does this review compare to yours?

http://www.light-reviews.com/fenix_l2d_ce_q5/
This review shows a 2-hour runtime on turbo.

Doesn't the Fenix has circuitry that keeps the light at full power until very near the time the batteries run out and the Deal Extreme light is providing less illumination but providing some light for a longer period? You have to have the same criteria for the brightness of the light over the entire run time or comparisions are meaningless. Which is better would depend on your objective. For cycling I prefer constant output over extended run time at greatly diminished output.