... and to install 3.The light is downy electronic ballast for fluorescent advertising light-boxSpecifications1) T4/T5/T8 electronic ... Adopt high quality semiconductor electroniccomponent,make highly use of light energy,good wear. 4.Ballast works in condition ... which should be matchwith T8/T4 lamp.Application:Hotels, chain restaurants,office buildings, museums, stadiums,exhibition centers, schools, ...