It consists of general metal halide lamp and ozone-free metal halide lamp.It is put chemicals which are series of Fel2 and they can make the emission the wavelength of except mercury from the tube of quartz which has diameter of 25-30mm.It also radiates light continuously from the part at 320-420nm.It can maximize the utility factor of UV than mercury lamp so it is good for any coating with colored or black colors and things which have thick coating.