Profoto 331528 Flashtube for B1 Monolight

The Profoto 331528 Flashtube is the factory-specified replacement tube for the Profoto B1 Monolight, one of the most widely used battery-powered studio strobes in professional photography. Flash tubes are consumable components that degrade over time — output becomes inconsistent, color temperature drifts, and eventually the tube fails entirely. Having a genuine replacement on hand means minimal downtime, whether you're working in a studio or on location.

Weighing just 3.2 ounces with compact 3 x 5 x 3-inch packaging, the tube is easy to store in a gear bag as a backup. Because it is a genuine Profoto component, it maintains the precise color temperature and flash consistency that the B1 system is known for. Installation follows the B1's standard tube-replacement procedure. For photographers who rely on the B1 Monolight for critical work, keeping a spare flashtube is a practical way to protect against unexpected equipment failure during a shoot.