I listed them into three categories, Compact, Medium, and Large – and included an example for each. An added perk into categorizing these LED flashlights by size is that you’ll be able to gauge what light to purchase that is specific to your needs.

Compact:

These compact LED flashlights range in length from 2 to 5 inches and come with up to 100 lumens of beam power. These little guys are perfect for a purse, car, office, and the outdoors. One little trick I learned while trout fishing is, by reversing the detachable light clip, you can slide it onto the brim of your hat and have an instant headlamp. Here’s an example of a compact LED flashlight:

Fenix LD10 LED Flashlight

Features:

Two Modes: General and Turbo (General and Turbo combine for 6 types of output: General Mode: 3 Lumens, 13 Lumens, 45 Lumens; SOS Turbo Mode: 45 Lumens and 100 Lumens (Strobe feature).
Waterproof and Submersible: 2 meters
Beam Distance: 87 meters
4” (Length) x .85” (Diameter)
2 ounces (without battery)
Uses one 1.5V AA battery

This flashlight, the Fenix PD10, is a favorite amongst my friends and colleagues. If you’re looking for something with the most features for the price, this is your light: Compact, Powerful, and Durable.

Medium:

The function of medium LED flashlights are the same as the compact lights but with one added perk, more strength to tackle extreme use. These lights, like the one listed below (TK15), are used to face the extreme conditions of the outdoors, law enforcement, and military use. They come in length from about  5 to 6.5 inches, diameter of about 1.5 inches, and up to 350 lumens of beam power. Those days of the D Battery Maglite that cops would carry are now being replaced with these medium sized LED lights that are many times lighter, brighter, tougher, and mobile.

Fenix TK15 Flashlight

Features:

Five modes of output, selected by turning the bezel: Low: 5 Lumens; Mid: 47 Lumens; High: 143 Lumens; Turbo: 337 Lumens; Strobe: 337 Lumens.
Waterproof
Beam distance: 215 meters
5.75” (length) x 1.34” (diameter)
5.3 ounces (excluding batteries)
Uses two 3V CR123A Batteries or one 18650 Battery

Large:

Large LED lights are serious lights for serious people. People fond of expedition, adventure sports, and emergency rescue crews have good use for these extreme lights. They’re still portable enough to carry with you – there are many models that come with an adjustable strap for carrying – but come with beams that will surpass any that have already been mentioned.

These lights range in length between about 7 to 10 inches and come with beam power ranging between 255 Lumens to 1500 Lumens (Romisen RC-T6). Yes, 1500 Lumens!

Fenix TK35

Features:

6 modes of output: Low: 12 Lumens; Mid: 109 Lumens; High: 346 Lumens; Turbo: 820 Lumens; Flashing: Strobe: 820 Lumens; SOS: 109 Lumens)
Waterproof and Submersible (2 meters)
Beam distance: 333 meters
6.45” (length) x 2.03 (Diameter: Head)
9.05 ounces (excluding batteries)
Uses four 3V CR123A or Two 18650 rechargeable batteries.