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User Manual

Features

· 

Purpose-designed for law enforcement, hunting and tactical 

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 930 lumens

· 

Second generation of ‘Crystal Coating Technology’ along with ‘Precision 

Digital Optics Technology’ provide extreme reflector performance 

· 

Boasts a peak beam intensity of 17,000cd and a throw distance of up to 

260 meters (ANSI FL1)

· 

High efficiency circuit board provides up to 200 hours runtime on lowest 

output level

· 

Infinite brightness adjustment from 0 to 930 lumens

· 

Two rapidly switchable functions to select from

· 

Multi-functional power indicator light displays low battery status

· 

Patented spring-loaded impact absorption mechanism with reverse 

polarity protection 

· 

Stainless steel titanium-plated two-way 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

Dimensions

Length: 153mm
Head diameter: 34 mm
Tube diameter: 25.4mm
Weight

145g (without battery)

Accessories

 

Quality holster, removable clip, tactical ring, lanyard, spare tail cap button 
and spare O-ring

Battery Options

NOTE:

1. Ensure batteries are inserted with the positive (+) end pointing to the 

head. The SRT6 will not operate with incorrectly inserted batteries.

2. Please do NOT light directly to the eyes, which will hurt the eyes.

Switching ON/OFF

To switch ON: Press the button on the tailcap until a “click” is heard.
To switch OFF: Press the button on the tailcap a second time until a 
“click” is heard.

Momentary Illumination

Momentary illumination can be achieved by switching the flashlight off 
and then half pressing and holding the tail switch. Release switch to turn 
the light off.

Adjusting Output

With the light turned on, slowly rotate the Smart Selector Ring (adjacent 
to the bezel) in a counter-clockwise direction to cycle through the 
following brightness levels: SOS -> standby mode -> infinite brightness 
modes -> turbo mode -> strobe mode. These modes may be cycled 
through in reverse by rotating the Smart Selector Ring in a clockwise 
direction.

Thanks for purchasing NITECORE!

Warranty Service

All NITECORE® products are warranted for quality. DOA / defective 
products can be exchanged for replacement through a local 
distributor/dealer within the 14 days of purchase. After 14 days, all 
defective / malfunctioning NITECORE® products will be repaired free of 
charge for a period of 18 months from the date of purchase. After 18 
months, a limited warranty applies, covering the cost of labor and 
maintenance, but not the cost of accessories or replacement parts. The 
warranty is nullified in all of the following situations:
1. The product(s) is/are broken down, reconstructed and/or modified by 

unauthorized parties.

2. The product(s) is/are damaged through improper use.
3. The product(s) is/are damaged by leakage of batteries.
To guarantee a swift and effective customer service, Nitecore suggest 
you to contact the point of purchase for assistance. 
For the latest information on NITECORE® products and services, please 
contact your national NITECORE® distributor or send an email to 
[email protected] 

The Nitecore official website shall prevail in case of any product data 
changes.  

®

ALL-ROUND Flashlight Expert

NITECORE (SYSMAX)

 is a member of PLATO, participating in and 

helping to develop the ANSI/NEMA FL1 standard of measurement. 
Product testing data is in accordance with these internationally 
recognized scientific standards.

Note: 

When using the SRT6 in infinite brightness mode, runtime will 

increase when lower levels of output are selected. On its lowest setting, 
the SRT6 will run continuously for up to 200 hours and on its highest 
setting continuously for up to one hour and 45 minutes.

NB: 

1. For user safety and to prevent overheating / failure, the SRT6 will 

automatically switch to high mode after twenty minutes of use in Turbo 
mode. Slowly rotate the Smart Selector Ring or press the tail switch 
again to reactivate turbo mode when needed. 

2. When the SRT6 is switched on standby mode, it will consume small 

amounts of power to maintain the settings in the MCU (micro control 
unit) but appear to be turned off. The power indicator on the light head 
will blink once every two seconds to indicate the SRT6 is in standby 
mode and to act as a locator.

Power Tips

1. With the light switched on, the power indicator will blink once every two 

seconds when power levels reach 50%.

2. With the light switched on, the power indicator will blink rapidly when 

power levels are low.

Changing Batteries

When the power indicator blinks rapidly it means the batteries need to be 
replaced. Alternatively if the light becomes dim or unresponsive to 
adjustment this also indicates batteries need to be replaced.

Maintenance

Every 6 months, threads should be wiped with a clean cloth followed by a 
thin coating of silicon-based lubricant.

NOTICE

The above data has been measured in 

accordance with the international 

flashlight testing standards 

ANSI/NEMA FL1 using one x 3.7V 

2600mAh Nitecore 18650 battery and 

2 x 3V 1550mAh Nitecore CR123 

batteries under laboratory conditions. 

The data may vary slightly during 

real-world use due to battery type, 

individual usage habits and 

environmental factors.

*

Infinite brightness adjustment varies 

from 0.1 to 930 lumens and is 

manually adjusted by rotation of the 

Smart Selector Ring. Subsequently, 

runtimes will vary anywhere from 105 

minutes to 200 hours depending on 

chosen level of output. 

Battery Installation

Insert one 18650 battery or two CR123 batteries with the positive pole 
pointing forward (toward the light head).

SIZE

Nominal voltage

Compatible

Primary Lithium battery 

CR123

3V

Y (Recommended)

18650 Rechargeable Li-ion battery

18650

3.7V

Y (Recommended)

Rechargeable Li-ion battery

RCR123

3.7V

Y

Output & Runtime

TURBO

LUMENS

930*

1

h

45

min

1

h

15

min

LOWER

LUMENS

0.1*

200

h

120

h

260m 

(Beam Distance)

17000cd 

(Peak Beam Intensity)

 IPX-8, 2m 

(Waterproof 

AND Submersible)

1.5m 

(Impact Resistant)

CR123

18650

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