Tha Mag LED upgrade you linked will create a pencil beam of light. Have a look at this beamshot thread taking note of the Mag LED (an XP-E) and the recommended Small Sun ZY-T08. Also look at this old beamshot thread specifically comparing the Mag incandescent, Mag LED, and KD C8 (typical 3A driven XM-L C8). Trying to spot an intruder with an XP-E pencil beam could be tough!
-Garry