When purchasing a strobe light for photography you should consider things like budget, output wattage, if it's battery powered, and if it's compatible with TTL—meaning it can communicate with your camera and adjust its intensity based on your camera’s setting. Strobe lights come in a wide variety of price ranges, although generally speaking lights that have higher wattage output capabilities, can be powered without being plugged into an outlet and have features like TTL or WiFi, will be more expensive than strobe lights that don’t have these features.