The Sofirn SC33 is an LED flashlight with a maximum output of 5,200 lumens and a stated beam distance of approximately 327 metres. It uses a single 21700 Li-ion battery, has built-in USB-C charging and offers six brightness levels as well as signalling modes.
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Light output and beam distance
The SC33 uses an XHP70.3 HI LED with a stated colour temperature of 6,000/6,500 K, producing cool white light. Its maximum output of 5,200 lumens is useful for illuminating a large area or a more distant object. The stated beam distance of approximately 327 metres does not mean that an object at that distance will always be bright enough to make out details comfortably.
The flashlight uses a boost driver to regulate power to the LED and help maintain brightness. That does not mean maximum output remains constant throughout use: temperature and battery charge, for example, can affect how output changes over time.
Modes and practical use
The SC33 has six brightness levels, plus strobe, SOS and beacon modes. Lower levels are useful when maximum output is unnecessary and the user wants to conserve battery power. Higher brightness can help illuminate a larger area or more distant spots.
Strobe, SOS and beacon provide intermittent light to attract attention or signal your presence. They can be useful for signalling outdoors, but they are not a substitute for other means of calling for help.
Battery and charging
The flashlight runs on one flat-top 21700 Li-ion battery. Charging is built into the flashlight via USB-C, with a stated input of 5 V and 2 A, so the battery does not need to be removed for charging.
The stated runtime on low is approximately 11.5 hours. The source material does not specify the brightness of that mode or the measurement conditions, so this should not be treated as the runtime for every type of use.
Dimensions and construction
The SC33 is 131 mm long, has a head diameter of 32 mm and weighs 110 g without the battery. Its dimensions allow it to be carried by hand or in a bag; it will weigh more with the battery installed.
The body is made from AL6061-T6 aluminium alloy. Aluminium contributes to the strength of the construction and helps dissipate heat, which is important in a high-output flashlight. The optics include hardened mineral glass and an orange-peel (OP) reflector, whose textured surface helps produce more even light coverage.
The stated IP68 rating indicates protection against dust and water. The flashlight is therefore intended for dusty environments and adverse weather, although the available source material does not specify the conditions for immersion.
Summary
The Sofirn SC33 combines high maximum output with a choice of brightness levels, signalling modes and charging without removing the battery. Its specifications make it of interest for outdoor and work use. For longer periods of illumination, bear in mind that the stated runtime applies to low mode and that the measurement conditions are not specified.
