... central power supply are easy to be damaged,so common emergency tube cannot work. When power-off , these tubes can ... *48*26cmFeatures1, Dual function,--common LED lighting and Emergency LED tube 2, Newest Lockable rotating end caps3, PC cover: frosted4, Material: AL ... , railway stations, factories etc.13, no mercury, environment friendly. led emergency lighting 1200mm 18w with rotating function