Exposed 50w MRC16 lamp (not included) provides functional accent lighting. Simply slide adapter over rail and thread on cap to install. Swivel, rotate and aim in any direction. Luminaires attach at any point along the rail. Use MR16 lamp and select the optional MR16 lamp accessory ring with glass lenses or honeycomb baffle for desired lighting effects. For use on single circuit rail, two circuit flexible rail and single circuit rail assemblies.