acording to Quickbeam's flashlightreviews.com
TASK FORCE 3w 2C [3.5 star rating]
Case Material= Machined anodized aluminum
Case Features= Rubber cover for grip
Switch Type= Tailcap reverse clickie
Lens Type= Collimator lens
Bulb Type= Luxeon III LED
Beam Type= Spot
Throw (Lux): ~ 3000
Overall Output: ~ 3170
Battery / Power Type= 2 x C cells
Battery Life= ~2 hr 30 min to 50% starting output
Environmental Protection= O-ring seals, splashable (possibly dunkable)
Retail Cost= 39.97 US$
http://www.flashlightreviews.com/reviews/taskforce_3w2c.htm
Streamlight Propolymer 4AA Luxeon [5 star rating]
Case Material= Polymer
Case Features= Slight texture, Lanyard hole
Switch Type= Rubber covered click button
Lens Type= Clear Polycarbonate
Bulb Type= Luxeon I LED
Beam Type= Spot
Throw (Lux): ~ 3000
Overall Output: ~ 2350
Battery / Power Type= 4 AA alkaline
Battery Life= 3 1/2 hr regulated, diminishing 4+ hr thereafter
Environmental Protection= O ring and rubber seals / Waterproof
Retail Cost= 32.25 US$
http://www.flashlightreviews.com/reviews/streamlight_propolyluxeon.htm
hope this helps