Energy Saving Professional Work and Study Lamp Spring-loaded arm and rotating shade provide many degrees of freedom for illumination Fine brightness adjustment cater to your optimal lighting needs Includes an ultra bright 27-Watt energy efficiency bulb rated 10,000 hours. Equivalent to an ordinary 120-Watt bulb Creates light very close to nature's own by using 4500K color temperature bulb (Cool White) Both freestanding and a clamp-mount are supplied. Clamp-on base mounts easily to most desks up to 2.25" thick surfaces