Nitecore SRT3 in Grey
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Nitecore SRT3 in Grey

by: Nitecore


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The Nitecore SRT3 Defender uses a single CREE XM-L (XM-L2 T6) LED that can go to a maximum output of up to 550 lumens with an NL166 (RCR123). Combined with a high efficiency circuit board and an NL166 (RCR123), AA or a CR123 batteries, it can provide varying runtimes at different lumen outputs: NL166 (RCR123)/550 lumens/45 minutes, AA/180 lumens/1 hour and CR123/330 lumens/1 hour and 15 minutes. It is also equipped with a couple of red and blue tactical lights that can be used for a variety of tactical and practical applications in the field when the need arises.

Nitecore SRT3 Specs

Tactical Flashlight YES
LED Brightness Level Waterproof Specifications (Width, Length, Diameter) Weight Battery
CREE XM-L2 2 output levels IPX-8 117.4mm (Length) 25.4mm (Bezel Diameter) 24.3mm (Body Diameter) 73g 1xCR123/1xRCR123/1xAA
ANSI/FSC   General Mode Flashing Mode 
    Turbo Lower Strobe SOS
1xNL166(RCR123) Output (lumens) 550 0.1 / /
Runtime 45min 150h    
Distance (134 m)      
Intensity (4500 cd)      
1xCR123 Output (lumens) 330 0.1 / /
Runtime 1h/15min 200h    
Distance (105 m)        
Intensity (2800 cd)        
1xAA Output (lumens) 180 0.1 / /
Runtime 1h 200h    
Distance (79 m)        
Intensity (1550 cd)        
Resistant (1.5 m)


    • Purpose-designed for law enforcement, self-defense and outdoor applications.
    • The world’s first line of flashlights to feature third generation SSR (smart selector ring) technology
    • Smoothly and rapidly select brightness levels and function by rotating a smart selector ring
    • Utilizes the latest CREE XM-L (XM-L2 T6) LED for a maximum output of up to 550 lumens
    • Second generation of ‘Crystal Coating Technology’ along with ‘Precision Digital Optics Technology’ provide extreme reflector performance
    • Boasts a peak beam intensity of 4,500cd and a throw distance of up to 134 meters (ANSI FL1)
    • High efficiency circuit board provides up to 200 hours runtime on lowest output level
    • Equipped with unique multi-colored (red and blue) tactical / signaling lights
    • Infinite brightness adjustment from 0.1 to 550 lumens
    • Six rapidly switchable functions to select from
    • Reverse polarity protection
    • Stainless steel titanium-plated clip
    • Stainless steel retaining ring protects core components from damage
    • Toughened ultra-clear mineral glass with anti-reflective coating
    • Constructed from aero grade aluminum alloy
    • Robust HAIII military grade hard-anodized
    • Waterproof in accordance with IPX-8 (two meters submersible)
    • Impact resistant to 1.5 meters
    • Tail stand capability
    • Length: 100 mm (3.9”) / 117 mm (4.6”)(with AA extension tube)
    • Head diameter: 25.4 mm (1”)
    • Tube diameter: 24.3 mm (0.96”)
    • Weight: 73g (2.57oz)(without battery) / 87g (3.07oz)(with AA extension tube)(without battery)
    • Quality holster
    • removable clip
    • AA extension tube
    • lanyard
    • spare tail cap button
    • spare O-ring

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