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  • Post last modified:January 19, 2023
ar15 mk18 light cloud defensive rein
Let's do a quick Cloud Defensive REIN review in this guide, and show potential buyers other cool weapon lights on the market besides Surefire.

We're going to check out its specs, beam performance, mounts and other great features of this light. Let's check it out:

Core Specs

  • CANDELA 60,000
  • LUMENS 1,400
  • RUN TIME 120 minuntes
  • LENGTH 6.172″
  • HEAD OD 1.40″
  • WEIGHT without battery 5.29 oz.
  • WEIGHT with battery 6.91 oz.
  • BATTERY 18650
  • WEIGHT with pic mount only: 6.14 oz.
  • WEIGHT with 18650 only: 6.91 oz.
  • WEIGHT with 18650 + pic mount: 7.76 oz.
  • COMPLETE KIT WEIGHT remote switch + 18650 + pic mount: 8.54 oz.
cloud defensive REIN with pressure switch

What's Included In The Packaging

cloud defensive rein packaging
cloud defensive rein all included items

Items included in the complete REIN packaging are:

  • Cloud Defensive REIN
  • 18650 Battery
  • NITECORE UI2 USB Charger
  • Tail cap control & Pressure switch
  • Sticker

What Applications Is REIN Best Used For

ddmk 18 with vortex uh1 gen 2

The Cloud Defensive REIN is great for:

  • Long range low light identification (Especially up to 200 yrds)
  • Defensive use
  • Tactical training

There are tons of unique features of this light that we would like to cover in this review guide. Let's start by checking out its components.

Cloud Defensive REIN Unique Selling Points

cloud defensive rein full size light disassembled
  • Insane thrower capability that can match Modlite's OKW or PLHv2
  • Super durable bezel construction
  • Thickest 3mm serviceable lens 
  • Flexible cable management

The tactical flashlights technology has came a long way from the days of just 120 - 300 lumens to what it is today.

Cloud Defensive took all positive things from traditional weapon lights over the years that people liked & redesigned the REIN from scratch while keeping the same Scout mounting footprint to work with existing accessories.

The Cloud Defensive REIN is a brand new light from the top to the bottom that has everything in one package, and the light head doesn't work with other light bodies.

Lumen & Candela Performance

cloud defensive rein light stream
cloud defensive light beam at night

The Cloud Defensive REIN can outputs up to 1400 lumens & 60K candela on a fully charged battery.

The Candela rating is the number one thing that people are going crazy about the REIN. 60K candela is the highest rating exist as far as in 2020 for a rifle mounted weapon light.

The user can use this light to illuminate an target area as far as 150 yards and to PID targets.

cloud defensive rein with eotech exps3

The light can take one single 18650 battery instead of still using 2 traditional CR123A batteries. At the time of reviewing the REIN, the weapon light industry is slowly transitioning away from CR123A and developing technology to support higher output products.

Beam Pattern & Color Tint

Cloud Defensive REIN light pattern 18650
Cloud Defensive REIN light beam and throw

At closer ranges, the reflector on the REIN can illuminate the surrounding to maximize situational awareness, and it can also throw the spill a bit further down range to provide more illumination.

The overall impression can be summarized in three words: Bright, Far & Slightly warm tinted beam

cloud defensive light beam color tint

The REIN's light beam does seem to have a warmer tint that reduces the color contrast of the area of interest under low light, which isn't a neutral white tint or cool tint.

Neutral white tint is the most preferred light beam color tint, which gives the user more accurate color rendition under low light.

cloud defensive rein on mk18 indoor

If the beam is too warm or too bluish. It can often skew the perception of certain color shades in the dark.

For example, white may look like blue, dark red may look like black...etc

It can be an issue for law enforcement & military applications where positively identifying things in the dark is paramount whether be a person or a building among many other color variations in the environment.

Configurable Tail Cap

cloud defensive rein tail cap modurality

Another cool feature of the Cloud Defensive REIN is its end cap design. It allows for better cable management by wiring the cable at 90 degrees instead of coming straight out from the back.

Pressure Switch & Cable Management

Cloud Defensive's LCS (Light Control System) is an unique pressure switch system designed for the Scout lights, and it's now integrated with the REIN to offer even more cable management support.

cloud defensive rein tail cap switch
mk18 with cloud defensive rein pressure switch

The new tail cap design have the following benefits:

  • No more force swing the cable around the switch to the other side
  • No more snag hazard & zero exposed cable
  • No more bending stiff switch cable that could degrade voltage flow
  • No more excess cable sticking out
  • No more zip tie
  • Perfect for clean SBR handguard setups

Unlike traditional weapon light setups with the "rear exit type" cable, they stick out on the rifle's handguard, and it can pose snag hazard.

However, the downside is that the REIN can't use any of the Surefire scout switches like the Unity Hot Button, TNVC TAPS and others.


cloud defensive branded USB battery charger

The REIN uses a single recharageable 18650 battery to support a higher outputs. It can also accept various types of 18650 batteries with different length dimensions.

Since not all 18650 batteries are made the same, especially length-wise, the added battery jack inside the body accommodates a wide variety of batteries from unprotected cell to rechargeable.

A typical 18650 battery is good for about 300 deep cycles that costs about $9-11 and it's rechargeable, while a non rechargeable CR123A costs about $1.

Not only the 18650 battery runs longer and harder, it saves tons of money and can be recharged on the go if you go one step further by using a USB solar battery bank, and the user no longer has to rely on the power grid.

Mounting Points

cloud defensive REIN scout light mounting footprint

Any scout light mounting accessories from Surefire, Arisaka, IWC...etc can be used with the REIN (Works for KeyMod, Picatinny & M-LOK)

cloud defensive REIN and Surefire M600 scout mounting footprint
cloud defensive rein on mk18 outdoor
Cloud Defensive REIN on SCAR17 KDG rail

Serviceable Lens & Bezel Durability

cloud defensive REIN lens bezel threads

The Cloud Defensive REIN features a serviceable lens for simple replacement. The bezel is made with S7 tool steel to significant beef up the durability of the light.

Since weapon lights are hard-use tools that subject to impact, shock, recoil & other physical abuse, the S7 tool steel has about 53 Rockwell rating and is the same type of steel used to make jack-hammer bits.

It's hard enough not to bend or crack.

Since the lens is one of the most common failure points on the light during force on force training, its 3mm thick glass lens are built to withstand multiple hits of 5.56mm simunition rounds at point blank distance. It's very strong and it's isolated from sharp vibration.

cloud defensive rein serviceable lens 3mm

If the lens break after running it hard, all you have to do is to replace the lens by disassemble the bezel.

Final Thoughts

cloud defensive rein in rain

The Cloud Defensive REIN is built much beefier than Surefire scout and Streamlight HLX. This is a field grade weapon light optimized to use on any rifles. However, if you're okay not be able to use any of existing Surefire tail cap accessories

Just a recap! there are 4 things that REALLY makes the CD REIN stands out:

Insane 60K Candela For Far Reach - Better target identification at longer distances that not many weapon lights on the market can achieve

Compatible With All Scout Mounts - Works with all popular scout light mounts that are readily available on the market today

Configurable End Cap For Better Cable Management - It eliminates annoying cable snag hazard and provides a clean setup.

Serviceable Lens For Easier Damage Replacement - Just replaces the lens instead of the light

Where To Buy

If you're interested in the Cloud Defensive REIN and loved everything you've seen so far in this review guide, you can visit Cloud Defensive to purchase the light directly (They offer military discounts)

Or check out OpticsPlanet (Discount codes offered & OP bucks can be earned).