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Sofirn · Sofirn SP35

Sofirn SP35 Standard Kit (2000 lm, Buck Driver, 21700)

2000 lm maxBuck driverLuminus SST-40 5000K (70 CRI)21700 batteryProprietary UIUSB-C C-to-C ok73g weight

SST-40 emitter exhibits slight green tint shift (positive Duv) at low drive levels, becoming neutral white at high/turbo levels.

Manufacturer page ↗All Sofirn SP35 variants

At a glance

Key specifications

Max output2000 lm
Throw332 m
Intensity27500 cd
Battery21700
EmitterLuminus SST-40
CRI70
ChargingUSB-C (C-to-C)
Length126 mm
Water resistanceIPX8

How it works

Controls & interface

Proprietary
2CDirect high / turbo
1HDirect floor / moonlight
4CElectronic lockout
3HStrobe / mood modes
Switchside eswitchPhysical lockoutAvailable

Performance behavior

Output & regulation

30-second output
1633 lm
5-minute sustained
850 lm
Driver
Buck
Regulated levels
Yes
Thermal control
Temperature feedback
PWM
Not detected / listed

Constant-current buck driver provides flicker-free, fully regulated output across all brightness modes without low-frequency PWM.

Why this matters: Buck and boost drivers step down or step up voltage efficiently using switching inductors, maintaining flat regulated output as cell voltage drains rather than dimming progressively like FET/linear direct drives.

Deep specs

Technical details

Structured fields used by the database and comparison tools.

Beam & emitter

Optic
reflector_SMO
Head diameter
28 mm
Emitter
Luminus SST-40
CCT
5000K
CRI
70

SST-40 emitter exhibits slight green tint shift (positive Duv) at low drive levels, becoming neutral white at high/turbo levels.

Battery & charging

Cell
21700
Battery included
Yes
Proprietary cell
No
Onboard charging
USB-C
USB-C to C
Yes
Low-voltage protection
Yes

Size & construction

Length
126 mm
Head diameter
28 mm
Weight
73 g
Body
aluminum
Finish
HA III hard-anodized
IP rating
IPX8
Impact rating
1 m

Carry & enthusiast features

Tail standsPocket clip: two way

Manufacturer / source data

Runtime claims

ModeOutputRuntimeRegulation
Eco1 lm1200:00Regulated
Low120 lm15:00Regulated
Medium400 lm6:00Regulated
High950 lm2:15Regulated
Turbo2000 lm1:53Regulated

Buck driver maintains flat, regulated output on High and Medium modes for the duration of the cell. Turbo steps down thermally to ~850 lumens and stays flat.

Price & availability

Where to buy

Typical price: €35

Trace the data

Sources & technical references

Use the original sources for context, revision details and methodology.

Manufacturer product page ↗Independent technical review ↗Machine-readable JSONPlain Markdown