Apparatus for disinfecting water; apparatus for disinfecting air; apparatus for disinfecting respirators, face masks, face shields, visors, gloves and other personal protection equipment, clothing and photoreactor equipment, namely photoreactors and medical diagnostic and patient care equipment; apparatus for disinfecting tools, furniture and solid surfaces; disinfectant apparatus for medical purposes; germicidal ultraviolet radiation apparatus for purifying air; air purifying units for household use; air purifying units for commercial use; air purifying units for industrial use; handheld apparatus for disinfecting air, water, respirators, face masks, face shields, visors, gloves and other personal protection equipment; handheld apparatus for disinfecting clothing, equipment, namely photoreactors and medical diagnostic and patient care equipment, tools, furniture and solid surfaces; ultraviolet radiation water treatment devices, namely those using ultraviolet light emitting diodes; water purification machines for domestic use; water purification machines for marine use; ultraviolet radiation devices for use in disinfecting water dispensing apparatus; ultraviolet radiation devices for use in disinfecting water supply apparatus; ultraviolet radiation devices for use in disinfecting air conditioning units; ultraviolet radiation devices for use in disinfecting building air supply units; apparatus for water treatment, namely apparatus using ultraviolet radiation for treating waterborne chemical and microbial contaminants; apparatus for air treatment, namely apparatus using ultraviolet radiation for treating airborne chemical and microbial contaminants