Shape & Size: PAR38 (Parabolic Aluminized Reflector, measuring roughly 4.75 inches in diameter). Base Type: E26 Standard Medium Screw Base. Wattage: 15-Watt LED (which delivers bright light while replacing traditional 90W to 150W halogen or incandescent bulbs). Lifespan: Roughly 22 to 25 years (based on standard daily use, often advertised as a 22.8-year lifespan).