economical: light only comes on when the lens is fully extended.Bulb does not require changing: The LED optics used by Eschenbachhas a virtually unlimited lifespan.Product PropertiesDiffractive, aspherical
economical: light only comes on when the lens is fully extended.Bulb does not require changing: The LED optics used by Eschenbachhas a virtually unlimited lifespan.Product PropertiesDiffractive, aspherical