44mm Lens + 50mm Reflector Collimator Base Housing + Fixed bracket for 20W-100W LED Light Lamp Details for the lens; Diameter: 44mm,Compatible with 10-100W led chip. Angle: 60 degree. Material: optical Aspherical glasses Temperature: -30-120C,Light transmittance: 98% 2 years warranty. 60 days money back guarantee by ER Chen.