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The Solarstorm light mentioned by willieb uses the fictitious "Chinese lumen count" for the CREE XML2 LED. If you look up the actual lumen output from the CREE website you will find this: "The XM-L2 LED offers the unique combination of high efficacy and high lumen output at high drive currents, delivering an unprecedented 1198 lumens at 116 lumens-per-watt efficacy at 3 A, 25°C." Two times 1198 does not equal 5000. I see single LED XML-T6 flashlights like the one I use with fake lumen counts as high as 10,000 lumens when the maximum output for the LED is around 1000 lumens. Buyer beware!.
The other two factors that limit brightness are heat and battery capacity. Notice the "3 A, 25°C". It takes a lot of power to run two of these at maximum output so battery life (run time) suffers. The other problem is heat. The LEDs produce a lot of heat when run at 3A so you need to dissipate heat to keep from ruining the LEDs. That is why a lot of expensive lights with high output automatically go to a lower mode after a few minutes in order to save the LEDs from destruction.