Heh, looks like I'm the only person on this site that likes MXDL "Luxeons". :nana:
Although my Police version has the switch on the side. Some tail cap clickies have been known to give trouble causing the light to flicker. I have a 12 LED that does that, but you might be Ok. Lucky dip.
Anyway back to the clone Luxeon, the 3W I have is dimmer than my 1W Dorcy 3D and draws about 390mah. Runs for about 2 hours near full brightness and usuable to about 5 hours total on 900mah nimh cells. The run time claims are rubbish. The wattage probably is too. But, I still like it cos it's small, still relatively bright, has a nice tint, good throw and smooth beam.
It's not a Ferrari but it's a nice little light and worth the $ IMO. You can do better but it will cost more $.