Comparison Console
Acebeam T37 vs Fenix TK21R
EDC Flashlights comparison. Compare price, weight, specifications, materials, and real-world use case.
Command Brief
Recommended read
Acebeam T37 stands out as the lightest option for weight, with about a 9% gap from the closest alternative. Acebeam T37 stands out as the cheapest option for retail price. Acebeam T37 stands out as the highest output option for max lumens, with about a 11% gap from the closest alternative.
Decision Signals
What stands out
Acebeam T37 stands out as the cheapest option for retail price.
Fenix TK21R stands out as the most expensive option for retail price.
Acebeam T37 stands out as the lightest option for weight, with about a 9% gap from the closest alternative.
Fenix TK21R stands out as the heaviest option for weight, with about a 10% gap from the closest alternative.
Fenix TK21R stands out as the lowest output option for max lumens, with about a 10% gap from the closest alternative.
Acebeam T37 stands out as the highest output option for max lumens, with about a 11% gap from the closest alternative.
Acebeam T37 stands out as the shortest runtime option for max runtime, with about a 1% gap from the closest alternative.
Fenix TK21R stands out as the longest runtime option for max runtime, with about a 1% gap from the closest alternative.
Specification Profile
Relative dimensions at a glance
Each axis is normalized against the largest raw value among the products in this comparison. Farther outward means a larger value, not necessarily a better result. Axes with an unverified value are omitted.
Price & carry
Retail price
US$129.9Cheapest
US$130.43Most expensive
Weight
202 g (7.13 oz)Lightest
221.4 g (7.81 oz)Heaviest
Length
145.2 mm (5.72 in)Shortest
153.3 mm (6.04 in)Longest
Output
Max lumens
4000 lmHighest output
3600 lmLowest output
Max candela
48400 cd
Unknown
Beam distance
440 m (1444 ft)Lowest
480 m (1575 ft)Highest
Max runtime
4320 minShortest runtime
4350 minLongest runtime
Power & durability
Battery type
21700 rechargeable battery
21700 lithium-ion
Charging type
USB Type-C
USB Type-C
Rechargeable
Yes
Yes
IP rating
IP68
IP68
Impact resistance
Unknown
1.5 m (5 ft)
Material
Black anodized aluminum
Aluminum alloy A6061-T6
Use case profile
Best for
Tactical useDuty useEDCSelf-defenseSearch and rescue
Tactical usePatrollingSearch and rescueTraffic inspectionSelf-defense
Common praise
High output with consistent brightnessTactile and easy-to-use rotary magnetic switchSolid build quality and durable anodized aluminum bodyLong runtime especially in Ultra Low mode (up to 72 hours)Convenient hidden USB-C charging portVersatile two-stage tail switchReplaceable battery
Very bright with strong beamSolid build qualityIP68 waterproof ratingLong runtimeFast USB-C chargingComfortable size for tactical useImproved tactile switch feel
Common complaints
Relatively heavy at 202 grams for cap or lightweight carryRotary switch requires multiple turns to switch between certain modesHolster is stiff initially and tight fitting
Larger size compared to some EDC flashlightsNo detailed mode descriptions available