mycosis fungoides fungus like mould disease(mf) premature baldness, alopecia areata, psoriasis,tinea versicolor, trichomycosis axillaries and other 50 kinds of diseases. the light source is molecules formed by xenon atoms (xe) and chlorine atom (cl) under the action of high frequency electric field . since the chlorine atoms(cl)can accept an electron from xenon atom,the two atoms are in an unstable electron configuration(excimer)after being excited and will strive to come back to its original form 308nm excimer light is in the middle wavelength of 290~320nm, also the most effective wave band, which can enhance the activity of tyrosinase in melanocytes to produce melanin quickly in melanocytes applicable places: hospitals, clinics and household. applicable skin diseases: vitiligo,psoriasis,generalized&chronic eczema and all kinds of dermatitis.syi