Feature: High quality Durable and portable, easy to carry, lightweight Energy saving lamps, also known as compact fluorescent lamps (CFLs) or low energy lamps, save energy by using the same technology as a fluorescent lamp to generate the equivalent light output of a conventional incandescent lamp but with a significantly lower power requirement. Due to the technology used, they also offer huge increases in lifespan compared to conventional lamps. The rated power of all energy saving lamps is much lower than the equivalent conventional lamp, which therefore costs less per hour. Specification: Material: Glass some electrical elements Light color: white Power: 11W-15W-20W Color temperature: 6400K Light head type: E27 Input voltage: 170-250V Frequency: 50-60Hz Size: 15.5 x 5 cm Net weight: 55g Package content: 1 x light bulb Note: Please allow 1-5mm error of the actual dimension due to manual measurement Thanks The actual color may be slightly different from the pictures due to computer screen's resolution, brightness, contrast, etc. If you have any questions, please contact us before leaving negative feedback, we will do our best to serve you, thank you for your understanding Specifications: High quality Durable and portable, easy to carry, lightweight Energy-saving lamps, also called compact fluorescent lamps (CFLs) or low-energy lamps, save energy by using the same technology as a fluorescent lamp to generate the equivalent light output of a conventional incandescent lamp but with a significantly lower power requirements. Due to the technology used, they also offer huge increases in lifespan compared to conventional bulbs. The rated power of all energy-saving bulbs is much lower than the equivalent conventional bulb, which therefore costs less per hour. Material: Glass some electrical elements Light color: white Color temperature: 6400K Light head type: E27 Input voltage: 170-250V Frequency: 50-60Hz Size: 15.5 x 5 cm Net weight: 55g Package content: 1 x light bulb Notes: Please allow 1-5mm error of the actual dimension due to manual measurement Thanks The actual color may be slightly different from the pictures due to computer monitor's resolution, brightness, contrast, etc. If you have any questions, please contact us before leaving negative feedback, we will try our best to serve you, thank you for your understanding