Welkin Electronics (Sanwei), a manufactuer of balastros electronicos for fluoresenct lamps in 120V & 277V, T8 and T5 type ... Welkin Electronics (Sanwei), a manufactuer of balastros electronicos forfluoresenct lamps in 120V & 277V, T8 and T5 type, mainly ... types2. UL & FCC listed model: Power factor>0.99 ballast electronicos to Central America