2U energy-saving light Made of glass tube, 12mm in diameter. Against heat resistant, nonflammable and with erosion-proof plastic shelf Heat insulation parts between tube and circuit board Application of the planting techniques to tubes not only increase the efficiency and also provides stable light output. The preheat starter inside is used for extending lifetime. Usage: Ideal for decorate lighting fixtures, households, hotels and offices. They are good substitutes of traditional white incandescent lamps. Voltage: 5W, 7W, 9W, 11W, 13W, 15W Cap Type: E27/B22/E14