A machine for applying ultraviolet light to curable coatings on floors and other wide area surfaces. A housing encloses rotating arms carrying UV lamps spinning about a central axis. Rotation is caused by reactive momentum from heated air jets coming from fans in barrels blowing air over heated wires, resembling hand held hair dryers, with the barrels supported under rotating arms. The heated wires are ballast for the lamps, providing thermal and electrical stability. The rotating lamps cover an annular pattern which, when advanced forwardly, becomes a linear swath, almost as wide as the housing. A floor, or similar surface, can be cured in a few minutes.