That is the light projected from a high-intensity beam in a single direction. CandelaĬandela, also known as candlepower, is used to determine the value of light that is concentrated into a single point. But keep in mind these do not work for the standard M600U. Surefire does make an M600DF, the DF standing for dual fuel, offers a single rechargeable battery called the SF18650B. Surefire offers a 123A Rechargeable Batteries set with a charger as well. Surefire offers their Streamlight SL-B26 Li-Ion USB Rechargeable Battery Pack for the ProTac HL-X. However, both Surefire and Streamlight have created their own rechargeable battery options. Battery Typeīoth, the X600U and the ProTac HL-X use 2 of the same 123A lithium batteries for power. So when the battery output starts to weaken so will the lights output.īut the nice part about these two flashlights is they have the exact amount of high output runtime of 75 minutes. If you are new to AR-15’s or weapon-mounted flashlights this term might not make sense to you.īut for the newbies to the game, high runtime is how long the flashlight will run at its highest available output before starting to dim.Ĭommon sense will tell you that a battery-powered item can’t run for an indefinite amount of time. Up until recently, Lumens were seen as the gold standard of determining flashlight brightness and people would tout their lumens to determine the best light.īut lumens leave out candela as well as beam throw and shape so we won’t get caught up on the lumens, which are the exact same anyway. While lumens are important there is more to light than just lumen count. Stats Comparisonįor this Streamlight vs Surefire comparison, we are going to take the manufacturers’ specifications from their respected websites and place them side-by-side and run down each section.īoth the Surefire X600U and the Streamlight ProTac HL clock in at 1,000 lumens. So for this comparison, we will be comparing these two lights since they are no contest the favorites in the two companies’ product lineup for AR-15 weapon-mounted flashlights. Two of the most popular AR-15 weapon-mounted flashlights from the Streamlight and Surefire offering are the Streamlight ProTac HL-X and the Surefire X600U.
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