Recent progress on UV lamps for industries

Radiation in nature so called daylight dominates only the small region in all wavelengths. UV-ray is located at higher energy region than that of daylight and induces some reactions, which is caused by an act as energetic particles. UV lamps with specific wavelength are controllable for selected reaction in the limited area and the time. They are tried in laboratories at first and applied in industrial plants with great progress of lamp components and their electric circuits. This article reviews the recent progress of industrial discharge lamps radiating UV, VUV, or other specialized wavelength.