Feature: Durable and portable, easy to carry, lightweight Energy saving lamps, also called compact fluorescent lamps (CFL) or low energy bulbs, save energy by using the same technology as a fluorescent tube to generate equivalent light outputs to a conventional tungsten filament bulb but with a significantly lower power requirement. Due to the technology used, they also offer a much longer life expectancy compared to conventional lamps. The marked wattage of all energy saving lamps is much lower than that of equivalent conventional bulbs, resulting in lower operating costs per hour. Specification: Material: Glass and electronic components 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 5cm Net weight: 55g Package Included: 1 x Light Bulb Note: Please allow 1-5mm variation in actual dimensions due to manual measurement. Actual color may vary slightly from images due to differences in screen resolution, brightness, and contrast. If you have any questions, please before leaving negative feedback. We will do our best to assist you. Thank you for your understanding.