A speedlight is a small, battery-powered electronic flash designed to mount on a camera’s hot shoe or fire remotely via a wireless trigger. Speedlight is the generic industry term; Speedlite is Canon’s specific branding, and Nikon calls its equivalents Speedlights, while Godox, Profoto, and other manufacturers use their own naming. These small flashes are the most versatile and affordable entry point into supplementary lighting, and they remain the workhorse units for event, wedding, photojournalism, and location portrait work.
A typical speedlight runs on four AA batteries or a dedicated lithium-ion pack, recycles between shots in fractions of a second to a few seconds depending on power level, and outputs roughly guide number 50 to 60 in meters at ISO 100. Power is set either in fractions of full output (1/1, 1/2, 1/4, down to 1/128 or 1/256) or automatically via TTL metering, where the camera fires a brief pre-flash, measures the return, and sets exposure. Manual control gives consistency; TTL gives speed when conditions change quickly.
Most modern speedlights tilt and swivel, enabling bounce flash off a ceiling or wall, which is the single fastest way to get flattering light indoors. They also support high-speed sync, allowing flash use beyond the camera’s normal flash sync speed for daylight fill, and rear curtain sync for motion-blur effects. Built-in or attached optical and radio receivers let speedlights fire off-camera, which is where they become genuine lighting tools rather than fill aids.
Compared to a studio strobe, a speedlight has much less raw power, slower recycle at full output, no modeling lamp on most models, and limited modifier compatibility. The trade-off is portability, battery operation, and price. A photographer can carry three speedlights, stands, and small modifiers in a backpack, set up anywhere, and produce work indistinguishable from studio output for many uses. The Strobist movement, founded by David Hobby in the mid-2000s, was built on exactly this premise.
Common modifiers for speedlights include small softboxes, beauty dishes scaled down for speedlight use, gels for color matching to ambient or creative effect, grids for tight beam control, and snoots for accent work. Wireless triggers like the Godox X-Pro, Profoto Air Remote, and brand-native systems from Canon, Nikon, and Sony provide reliable radio triggering at distances up to 100 meters or more, with TTL pass-through, power adjustment from the camera, and group control across multiple flashes.
Common mistakes include running speedlights at full power continuously, which overheats them and eventually melts the Fresnel head, ignoring color shifts as the flash cycles down toward empty batteries, and pointing the head directly at the subject when bouncing would produce a far better result. Treat the speedlight as a tool with a limited duty cycle and rotate units across long shoots when continuous use is required.