Efficient LED lighting: A powerful and efficient 4 W replaceable LED provides 500 lumens of light at 3000 K for a lifetime usage of 20,000 hours. Clean and useful lighting: Shape of the head gives a good diffusion of light onto the work surface. Adjustable flexible arm: Customise your lighting solution by using the adjustable arm of the lamp, twisting or turning it to suit your needs. French design: Designed with a French collaboration, the sol exudes simplicity and modernity. Clean round base: The base measures 14 cm around, providing a slim and easy to position lamp for any desk size.