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 significant increases in life expectancy over conventional lamps. The marked wattage of all energy saving lamps is much lower than that of equivalent conventional bulbs, therefore costing less per hour. Specification: Material: Glass and electrical 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 measurement deviation due to manual measurement. Actual color may vary slightly from images due to screen resolution, brightness, and contrast settings.