Comparison Console
Fenix TK21R vs Olight Seeker 4 Pro
EDC Flashlights comparison. Compare price, weight, specifications, materials, and real-world use case.
Command Brief
Recommended read
Fenix TK21R stands out as the lightest option for weight, with about a 1% gap from the closest alternative. Fenix TK21R stands out as the cheapest option for retail price, with about a 7% gap from the closest alternative. Olight Seeker 4 Pro stands out as the highest output option for max lumens, with about a 28% gap from the closest alternative.
Decision Signals
What stands out
Fenix TK21R stands out as the cheapest option for retail price, with about a 7% gap from the closest alternative.
Olight Seeker 4 Pro stands out as the most expensive option for retail price, with about a 7% gap from the closest alternative.
Fenix TK21R stands out as the lightest option for weight, with about a 1% gap from the closest alternative.
Olight Seeker 4 Pro stands out as the heaviest option for weight, with about a 1% gap from the closest alternative.
Fenix TK21R stands out as the lowest output option for max lumens, with about a 22% gap from the closest alternative.
Olight Seeker 4 Pro stands out as the highest output option for max lumens, with about a 28% gap from the closest alternative.
Olight Seeker 4 Pro stands out as the shortest runtime option for max runtime, with about a 99% gap from the closest alternative.
Fenix TK21R stands out as the longest runtime option for max runtime, with about a 7150% 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$130.43Cheapest
US$139.99Most expensive
Weight
221.4 g (7.81 oz)Lightest
223 g (7.87 oz)Heaviest
Length
153.3 mm (6.04 in)Longest
133 mm (5.24 in)Shortest
Output
Max lumens
3600 lmLowest output
4600 lmHighest output
Max candela
Unknown
16900 cd
Beam distance
480 m (1575 ft)Highest
260 m (853 ft)Lowest
Max runtime
4350 minLongest runtime
60 minShortest runtime
Power & durability
Battery type
21700 lithium-ion
21700 rechargeable lithium-ion (proprietary)
Charging type
USB Type-C
USB-C, magnetic (optional MCC3 charger)
Rechargeable
Yes
Yes
IP rating
IP68
IPX8
Impact resistance
1.5 m (5 ft)
1.5 m (5 ft)
Material
Aluminum alloy A6061-T6
Anodized aluminum alloy with rubberized grip
Use case profile
Best for
Tactical usePatrollingSearch and rescueTraffic inspectionSelf-defense
EDC useCampingHikingMaintenanceNight dutyDog walkingEmergencyFlood illuminationTerrain lighting
Common praise
Very bright with strong beamSolid build qualityIP68 waterproof ratingLong runtimeFast USB-C chargingComfortable size for tactical useImproved tactile switch feel
Bright output with a wide and smooth flood beamConvenient dual charging options including USB-CIntuitive rotary switch with stepless dimmingDurable IPX8 waterproof ratingBuilt-in charging holster with multiple carrying options
Common complaints
Larger size compared to some EDC flashlightsNo detailed mode descriptions available
Auto-lock feature can be frustrating without holsterWeight may be heavy for some users for pocket carry