When it comes to specific lumens in pocket flashlights, 100–250 lumen is on the lower end of the spectrum, but it’s sufficient for close-range, indoor use. Power Source: Rechargeable pocket flashlights are convenient, but battery-operated options offer more flexibility. Length: Longer pocket flashlights provide more grip, while shorter picks are more portable. Pocket flashlights vary in length, so consider what size best fits your needs. Water-Resistance: Pay attention to a pocket flashlight’s IP rating.