Streamlight 20603 SL-20L Review in 2022 Honest Write-up About A Flashlight

Looking for a full-sized LED flashlight?

Well, no more searching needed. We have bought you one of the best full-sized LED flashlights on the market in 2022. This Streamlight SL-20L is a big flashlight which is perfect for keeping in your offices or in your homes.

Check out the detailed features below.

Streamlight 20603 SL-20L Review

Streamlight 20603 SL-20L Review


More than 75 people on Amazon gave this flashlight a massive 4.1-star rating out of 5. This flashlight is really well taken by the customers.

Who can use this Flashlight?

According to the manufacturer, this flashlight is perfect for Law Enforcement, Fire & Rescue, Utility, Security, Automotive, Industrial, Sporting Goods and Normal Home Use.

Batteries & Charger

Let’s talk about the batteries now, shall we?

Streamlight SL-20L comes with a 5 cell 6 Volt Ni-Cd or a Ni-MH sub-C battery. This battery pack is rated at a lifespan of 1000 full recharging cycles.

This particular pack from Amazon will give you two types of charge in the package. One will be the regular 120 Volt AC charger and another would be the 12 Volt DC charger. Both the chargers are capable of charging the battery to 100% in 7 hours.

There is also a charging indicator on the head to provide status lights.


As with all the Streamlight flashlights, this one also has a C4 LED bulb installed in it.

This C4 LED has a very high brightness output and is very efficient when using the power from the battery. It is shockproof and nearly unbreakable. The total lifespan rating of this C4 LED is 50,000 hours.

Cool, yeah?

Lens and LED Housing

You will get a deep-dish parabolic reflector in this flashlight. This reflector is really good because it keeps the beam of the light very tight and along with that keeps the peripherals illuminated properly.

The electronic system in the housing is very important because it regulated the intensity throughout the different battery levels which helps prevent any damages.

The outer front lens of this flashlight is unbreakable because it is made out of polycarbonate. It is even coated with an anti-scratch material.

Modes & Runtimes

There are 4 modes on this Streamlight LED flashlight. They are as follows:

  • Low mode: the low mode will run for a maximum of 50 hours on a single charge while giving out 10 lumens of output. The candelas on this mode will be 1000, and the beam throw distance will be 205 feet.
  • Medium mode: you will get 27,000 candelas light intensity, 4 hours of runtime, 160 lumens of output power and 1079 feet of maximum beam throw distance in this mode.
  • High mode: the high mode dishes out 350 lumens of output for 2 hours continuously. The maximum beam throw distance in this mode will be more than 1600 feet, and the light intensity will be 60,000 candelas.
  • Strobe mode: you can get continuous strobe mode for 4 hours.


They have added a multifunctional push barrel switch on this flashlight. You can operate this flashlight with one hand with ease. You just have to press the button to shuffle through different modes of light intensities.


The casing of this flashlight is made out of machined aircraft grade aluminum and has a type II anodized finish on it as well. it even has an anti-slip design on the surface to prevent the flashlight slipping from your hands when they are wet.

If you ever drop your flashlight, you don’t have to worry as it is already designed to withstand drops from 3 to 4 feet.

The flashlight is serialized for positive identifications as well.

Waterproof Rating

This flashlight is not waterproof and should not be used in wet conditions.

Dimensions & Weight

The length of this flashlight is 13.1 inches and the diameter is 2.5 inches. The weight is only 1.7 pounds.


The flashlight meets all the standards and European community directives.


Limited lifetime warranty is provided by the manufacturer on this flashlight.


The following things are provided in the package:

  • Streamlight LED flashlight
  • 120 Volt AC charger
  • 12 Volt DC charger
  • Safety wands
  • Ring holder
  • Nylon holster
  • Full-sized LED flashlight.
  • Long runtimes on low mode.
  • Very bright and has a long throw.
  • CE approved.
  • High ratings on Amazon.
  • Optimized electronics.
  • C4 LED bulb used.
  • It is made with aircraft grade aluminum.
  • Limited lifetime warranty.
  • Unbreakable polycarbonate lens.
  • scratch-resistant coating.
  • knurled barrel.
  • Not water resistant.
  • CREE XPG LEDs over CREE XM-L LEDs therefore, consumes more power.
  • No SOS mode.
This flashlight will only be suited to people who want a full-sized flashlight. It is not a compact flashlight so make sure you check out the dimensions of this flashlight before purchasing. Other than that, it is a fantastic flashlight for anyone to use. It has power, brightness and a very strong and durable body. If you want a simple yet powerful flashlight, then go for it!

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