Light and Motion Stella 500 Short Cable Light Head only 500 Lumen output certified to the FL-1 Standard Engineered with the best CREE LED and enhanced firmware Custom engineered micro-peened reflector optimizes the light to provide a smooth, even beam pattern that focuses the light exactly where you need it Beam pattern was engineered to maximize riders' depth perception using optics eliminating snowball effect with a clean transition across the beam Lighthead Only - Battery not included 3.25 inches high 3.5 inches wide 500 Lumen output certified to the FL-1 Standard Lighthead Only - Battery not included