POLICE Logo
MenuMENU
SearchSEARCH

Police Product Test: Streamlight SL-20L Flashlight

Historically, the biggest hurdle with LED technology has been getting the "candela" or "candlepower" to compare to that of an incandescent. LEDs generally put out high "lumens," meaning they are really bright at close distances, but not as good at casting light in the distance. Streamlight figured out how to do both with this one.

May 25, 2012
Police Product Test: Streamlight SL-20L Flashlight

Photo: Mark W. Clark

Streamlight has been making the "gold standard" SL-20 flashlight for years. It is probably safe to say this light is almost as synonymous with police work as handcuffs and black-and-white cars. I have one and, like most cops, mine has accompanied me on more calls than I can count. I've replaced the battery stick, bulb, switch, and seals. The finish isn't quite as pretty as it used to be, but it is every bit as dependable as it was when I bought it eight years ago.

A few years back Streamlight came out with a polymer version that had three LEDs in addition to the incandescent lamp. Most of us saw it as a slight improvement over the original but not enough to justify buying a whole new set-up. Cops love new gear, but if we're going to spend our hard-earned money, it better be well worth it. In my opinion the new Streamlight SL-20L is definitely worth it. Everything that was great about the original is still here. Everything we wished it did better? Yeah, that's here now, too.

Ad Loading...

Historically, the biggest hurdle with LED technology has been getting the "candela" or "candlepower" to compare to that of an incandescent. LEDs generally put out high "lumens," meaning they are really bright at close distances, but not as good at casting light in the distance. Streamlight figured out how to do both with this one.

The SL-20L is an anodized aluminum, rechargeable light with a polycarbonate lens and a single C4 LED. It has a large, simple rubberized on/off switch on the side near the front bezel. The company claims 350 lumens and 60,000 candela on the highest of three brightness settings. This translates to a wide, bright white beam that will illuminate objects out to 490 meters. I stood in my driveway and was able to clearly read the license plate of a vehicle five houses away; pretty impressive for a handheld. There's also a strobe feature for use as a defensive or signal light.

The battery life is claimed at two hours on the brightest setting. I charged the light for the recommended 24 hours when I received it, and it is still going strong after a few nights of use. I prefer the highest setting, even for up-close use, but have tried the other settings as well and even the dimmest of the three puts out plenty of working light.

When it is time to recharge, the SL-20L is fully compatible with the original SL-20 chargers. This is good news for those of us with the original as we can now upgrade to the new technology without having to buy new chargers. I can see this light having a spot in my bag of gear for a long time and would definitely recommend it to anyone.

Streamlight SL-20L Flashlight Specs:

Weight: 1.7 pounds

Length: 13.1 inches

Battery: NiCd or NiMH rechargeable up to 1,000 times; fully recharges in 7 hours

Technology: C4 LED

Modes: High, medium, low, and strobe

Peak Beam Intensity: High 350 lumens, medium 160 lumens, low 10 lumens

Runtime: High 2 hours, medium 4 hours, low 50 hours, strobe 4 hours

Construction: Anodized machined aluminum with knurled barrel for a sure grip, polycarbonate lens with scratch-resistant coating

Warranty: Limited lifetime

Price: $223

A.J. George is a motor officer and firearms instructor for the Scottsdale (Ariz.) Police Department.

Ad Loading...
Subscribe to our newsletter

More Training

patrolfinder - reducing crime thumbnail
SponsoredOctober 27, 2025

How One Police Department Cut Crime by 46% with Smarter Patrol Management

Discover how one police department cut crime nearly in half using smarter patrol data. This whitepaper breaks down the real-world strategy behind a 46% drop in vehicle thefts, improved officer safety, and stronger community visibility.

Read More →
Thumbnail for video series POLICE Topics, Tactics & Tips with a yellow headline that reads When Do You Transport a Wounded Officer Instead of Waiting for EMS?
Patrolby Wayne ParhamOctober 26, 2025

When Do You Transport a Wounded Officer Instead of Waiting for EMS?

Thumbnail for video series POLICE Topics, Tactics & Tips with a yellow headline that reads When Do You Transport a Wounded Officer Instead of Waiting for EMS?

Read More →
Safariland header photo
Sponsoredby David ReederOctober 22, 2025

Is Your Duty Holster Duty Rated?

The first – and worst – time I had to fight to keep my gun, my holster and duty belt held up far better than my training did.

Read More →
Ad Loading...
Flock Safety Webinar Banner
SponsoredOctober 7, 2025

Beyond the Plate: Real-Time Video Intelligence for Police Operations

Join us for an inside look at how agencies are enhancing frontline decision-making with visual intelligence that goes beyond the plate. This session will show how pairing LPR data with live camera feeds delivers faster, safer, and more coordinated responses—on everything from stolen vehicles to active BOLOs.

Read More →
Coffee Break With Police Experts thumnail for topic of Using Your Patrol Vehicle for Cover.
Sponsoredby Wayne ParhamOctober 3, 2025

Coffee Break with Police Experts: Using Your Patrol Vehicle for Cover

In this video, hear from Dustin Mowery, a product specialist at Team Wendy, as he discusses how to best use a patrol vehicle for cover.

Read More →
Two police officers in tactical vests, demonstrating emerging law enforcement technology
SponsoredSeptember 1, 2025

Ebook: How Data-Driven Policing Strengthens Transparency and Public Trust

Whether your department is focused on improving transparency or rebuilding community confidence, this ebook offers real examples and practical strategies to help. Learn how data-driven insights and modern fleet technologies can strengthen accountability, support officer safety, and enhance public trust.

Read More →
Ad Loading...
Police officer crouching behind vehicle, holding rifle in tactical stance
Vehicle Opsby Wayne ParhamAugust 29, 2025

Using Patrol Vehicles for Cover

While a patrol vehicle offers some cover protection when taking fire, remain mobile and don’t stick to one piece of cover indefinitely. Dustin Mowery, of Team Wendy, shares what he teaches about using vehicles as cover.

Read More →
TrainingAugust 25, 2025

San Francisco Police Recruit Dies in Training

Recruit Officer Jon-Marques Psalms, 30, reportedly suffered a medical emergency after completing a training exercise on Wednesday August 20, 2025, at the Academy.

Read More →
TechnologyAugust 25, 2025

POLICE and Flock Safety Present Webinar on Combining LPR with Real-Time Video

The webinar titled “Beyond the Plate: Real-Time Video Intelligence for Police Operations” will show how pairing LPR data with live camera feeds delivers faster, safer, and more coordinated responses on everything from stolen vehicles to active BOLOs.

Read More →
Ad Loading...