I love bright lights and this is by far my brightest to date.
The spec quotes 10,000 lumens from 7 x Cree emitters. I dont currently have a way of verifying the exact brightness but what I can say is it is EXTREMELY bright, in fact painfully bright if you inadvertently glance its way while on full beam.
It has three modes all of which are operated from a single button. Full brightness with the first press, roughly one third brightness on the second press and strobe by a l o n g press.
As reported by others, these torches, when on full power, generate a sizeable amount of heat. Be aware, this CAN cause problems if the are enclosed in say a pocket and the button accidentally pressed.. I had this very problem and the torch was too hot to hold. Luckily nothing was damaged but it could have been very dangerous if left next to something flammable or even a mobile phone.