Hi! I am new to technical things here about flashlights. But can anyone explain, how a Four Sevens Minix 123 produces 210 OTF Lumens using a single CR123 cell and CREE XM-L T6 LED combo (manufacturer advices not to use rechargeable RCRs which are 3+ Volts), whereas a Ultrafire CREE XM-L T6 does 900+ Lumens out of a Single 18650 cell (3.7 Volts). Both uses the same CREE XM-L T6 LED. Does it mean the XM-L T6 LEDS are able to produce more Lumens if driven harder? If so, how much is the max Lumens that can be achieved with a Single XM-L T6 LED without damage to the lamp?