[Review] - Nitecore EDC33 Tactical EDC Flashlight 4000 lumens USB-C 18650 4000mAh - by Lock


Newly Enlightened
Jan 10, 2017
Hello everyone...today we will see the Nitecore EDC33: first Nitecore flashlight use the new LUMIN SHIELD technology and equipped with 9-Core NiteLab UHi 20 LEDs The flashlight was provided to me directly by Nitecore specifically for the review. Here you can find the link of the company and here the product link.


Packaging and contents
The Nitecore EDC33 arrives in a black cardboard box with some of its main features written on it. Inside the package we find:

  • Nitecore EDC33 Flashlight
  • Built-in Nitecore 18650 4000mAh Li-ion battery
  • USB-C charging cable
  • Belt clip
  • Lanyard
  • User manual




Main features
  • Uses a 9-core UHi 20 MAX LED with a maximum output of 4,000 lumens
  • Maximum light beam intensity of 54,500 candelas and maximum range of 450 meters
  • 4 brightness levels to choose from; SEARCH and LUMIN SHIELD™ mode available
  • Powered by a built-in 4,000 mAh lithium battery for up to 63 hours of battery life
  • Lock switch available for Half Lockout and Full Lockout mode
  • The power indicators show the remaining battery charge
  • Intelligent lithium battery charging circuit with USB-C charging port
  • Advanced Power Off Technology (APC) for ultra-low standby power
  • Highly efficient constant current circuit for stable power
  • Built-in advanced temperature regulation (ATR) module (Patent No. ZL201510534543.6)
  • Optical lenses with anti-scratch coating on both sides
  • Made of military grade 7075-T6 aluminum alloy
  • HA III military grade hard anodized finish
  • Tail standing ability
  • Water and dust resistant to IP68 rating (submersible to 2 meters)
  • Shock resistant up to 2 meters
  • Length: 115.6 mm (4.55 inches)
  • Head diameter: 25.4 mm (1.00 inches)
  • Tube diameter: 24.0mm (0.94 inch)
  • Weight: 121 g (4.27 oz) (without clip) / 127 g (4.48 oz) (with clip)

The body and the materials

The Nitecore EDC33 represents a notable step forward in flashlight technology, implementing the new LUMIN SHIELD™ technology. Equipped with the powerful NiteLab UHi 20 Max with "9-Core", this flashlight offers a combined beam for versatile use: there is a main LED for a concentrated beam and 8 auxiliary LEDs for a wide and bright diffused light.



Powered by a built-in 4000mAh 18650 battery, the flashlight offers multiple output modes including a comfortable Ultra-Low (5 lumens / 2 days 15 hours), a High level (1200 lumens / 2 hours 31 min), and the search (1700 lumens) equivalent to Momentary Turbo (Spot).
The flashlight is designed to be water resistant (IP68, 2m) and shock resistant (2m drop resistance). The user interface is managed entirely by the single electronic switch and there is a "Rapid Lock™" physical block to prevent unwanted activations.


The anodization is uniform and flawless and the clip is sturdy and ensures a good grip on clothes.





There are deep grooves on the body that always guarantee a secure grip, even with wet hands or gloves.


La tail is not flat but it is possible to use the light in tailstanding mode




The Type-C port is hidden near the tailcap through a rotating ring



There are deep dissipation fins


It is comfortable in the hand, the switch is large and easy to activate


User interface

Momentary Tactical Lighting:

  • Press and hold the tail button to enter SEARCH mode (release to power off).
  • Press and hold the tail button fully to enter LUMIN SHIELD™ mode (release to power off).


  • Turn on: Fully press the tail button when the flashlight is off.
  • Turn off: Fully press the tail button when the flashlight is on.

Variation of brightness levels:

  • With the light on, half-press the tail button to cycle through the brightness levels: ULTRALOW - LOW - MID - HIGH.

Direct Access to SEARCH:

  • With the flashlight on/off, half-press and hold the tail button to directly access SEARCH (1,700 lumens).

Direct Access to LUMIN SHIELD™:

  • With the flashlight on/off, press and hold the tail button fully to directly access LUMIN SHIELD™ (4,000 lumens)


  • The flashlight has two lockout modes (Half Lockout Mode and Full Lockout Mode).

Half lock mode (Rapid Lock™):

  • For Half Lockout Mode, slide the lockout switch up while holding the tail button halfway or fully.
  • HOLD (1/2 press) / HOLD (1 press) + Slide the lock switch to "LOCK" (the logo is visible when activated). The flashlight is now in Half Block mode. -> Only Search and Lumin Shield TM modes are available. All other modes cannot be accessed.
  • Slide the lock switch to "UNLOCK" (the logo is hidden when activated) and 1 Press to turn on the flashlight → The flashlight is now unlocked. -> All modes are available.
  • Note: It is not possible to switch directly from partial lock mode to full lock mode. The flashlight must be unlocked (step 2 above) from partial lock mode before you can activate full lock mode.

Full lock mode (Rapid Lock™):

  • From off: Slide the lock switch to "LOCK" (the logo is visible when activated). The flashlight is now in full lock mode.->No mode is available
  • Slide the lock switch to "UNLOCK" (the logo is hidden when activated). The flashlight is now unlocked.->All modes are available.
  • Note: Slide the lock switch to "LOCK" while the flashlight is on, the flashlight will turn off.

ATR (Advanced Temperature Regulation):

  • ATR technology adjusts torch output based on working conditions and the surrounding environment to maintain optimal performance.

Power Indication:
The power indicators light up to indicate the remaining battery level.
When the light is on, the battery indicator will light green as follows:

  • Battery indicator x 4 → 75% to 100%
  • Battery indicator x 3 → from 50% to 74%
  • Battery indicator x 2 → from 25% to 49%
  • Battery indicator x 1 → <25%; please reload.
Note: When the flashlight is turned off and fully UNLOCKED, a half press will show the battery charge indicator for about 5 seconds.

Obstacle detection sensor:
Next to the LEDs there is an integrated optical sensor. When an "obstruction" is detected, the mode output will temporarily drop from HIGH level to MID level, and once the "obstruction" is removed, the light will return to the original output.
Note: This function can be turned off by pressing 1/2 press when the mode output automatically drops to MID level and the flashlight will return to HIGH level.
When the flashlight is set to HIGH and the optical sensor detects an obstacle, the brightness will automatically decrease to 300 lumens to avoid overheating.
Notes: Recharge the battery when the light appears dim or the flashlight becomes unresponsive due to low charge. Keep the lens clean to ensure proper sensor function.

Beam, tint and beamshot

The relatively deep Orange Peel reflector combined with the UHi 20 LED placed in the center of the dish generate a beam of which a spill, a crown and a hotspot are clearly visible.


The beam is oriented more towards "throw", ideal for recognizing objects at medium distances.
8 auxiliary LEDs provide a large area of flood-oriented light (Lumin ShieldTM mode)


The beam profile shows an almost perfectly circular hotspot with a slight corona and a wide spill. Some beam artifacts are present when viewing on a white wall.
The hotspot is cold white in color with slight toning, imperceptible during normal use, on yellow-greenish hues.

Below are some shots in the dark.

Beamshot #1


Beamshot #2


Final Considerations


  • LUMIN SHIELD™ technology for innovative modes.
  • UHi 20 Max LEDs and 8 auxiliary LEDs for a versatile beam.
  • Robust design in HAIII aluminum (7075-T6).
  • Intuitive user interface with "Rapid Lock™" physical lock.
  • Water and shock resistant.


  • Non-removable battery
  • Slight color changes

Thanks for reading!


Newly Enlightened
Nov 7, 2011
Wow what a review for that light. Thanks a lot.
I must say I own 2 of this one for work and one at home. So far a very good light ,but that tail switch is not good. You can never be sure if you press the button the light will go on or not. I opened the tail for inspection to see how it worked. And replaced that little plastic part with some one that I designed and 3D printed. Now it's a little better, but I hope when the Nitecore EDC34 comes out they changed that button.