Sofirn SP35 Review
Here’s the rundown from Sofirn:
* Luminus SST40 6000K - 6500K
* Operating voltage: 3.0V – 4.2V
* Driver: Constant current buck driver
* Battery options: 1x 21700 rechargeable lithium-ion battery
* Dimension: 126mm (length) × 28mm (head diameter)
* Weight: 73 grams (without battery)
* Flashlight body: Aerospace grade 6061 grade aluminum alloy, hard-anodized to military grade specification type III
* Toughened mineral glass lens
* Water resistance i.a.w. IPX-8 (up to 2 meter under water, not for diving)
* Mode Memory: memorizes the last brightness level used in the general modes (Eco/Low/Med/High)
* Wrong polarity protection from improper battery installation
* Low voltage warning: yes
* Low voltage protection: yes
* Advanced Temperature Regulation (ATR) technology
What’s inside the box:
* Sofirn SP35
* 4000 mAh 21700 battery
* Reversible pocket clip
* USB-A to USB-C charging cable
* Lanyard
* User manual
* Spare o-rings
Operation details:
* Choice of stepped (default) or ramped modes (4x click from On)
* Shortcut to Moon from Off (hold)
* Shortcut to Turbo from Off or On (2x click)
* Lockout with momentary Moon (4x click from Off)
* Battery indicator LED in the switch
Other info/observations:
* Nicely regulated buck driver
* USB-PD (USB-C to USB-C) compatible
* Charging rate of 2A (spec, I observed 1.8A)
* Charging termination: 4.15V
* Low voltage cutoff: 2.90V
* This is from the initial batch where ATR is not enabled
Runtime & Measurements
- In Turbo mode, it’s way too hot after 5 minutes
- In High mode, it hovered around 54°C
- Using a maukka calibrated lumen tube…
- Turbo spec is 2000 lumens, I saw 1740 lumens at 0 seconds and 1677 at 30 seconds
- High spec is 950 lumens for 3 hours and 40 minutes, I saw 840 lumens for 2 hours and 16 minutes
- Medium lumens: 357 (spec: 400)
- Low lumens: 114 (spec: 120)
- Eco lumens: 14 (spec: 7)
- Moon lumens: 0.4 (spec: 1)
- Throw spec: 27,520 cd for 332 meters
- Throw measured: 24,250 cd for 311 meters (pretty close to spec)