Features ? Patented 10,000-hour 27W Global Cooling bulb for indoor sunlight ? Virtually eliminates the glare that causes eyestrain and headaches ? No-buzz operation and instant-on flicker-free light ? Full Rotational Lamp Head Telescopes 11.5 to 17.5 inches ? 3-year manufacturer?s limited warranty With timeless design, all-metal construction, hand-polished finish, and microprocessor controlled power adapter, the Heritage? lamp is built to last generations. Backed by 50 years of research, this lamp scientifically tunes exclusive Full Spectrum indoor sunlight for readers? eyes - all the benefits of full spectrum daylight, without any of the harmful UV and glare. Verilux® Optix glare control optimizes black-white contrast and reduces harmful flicker and glare to eliminate eyestrain and enhance vision. Patented 27 Watt Global Cooling? bulb produces 150 Watts of light and lasts 10,000 hours - more than 10 times the life of traditional bulbs. 3-way switch lets you choose to give you the equivalent of a 75, 100 or 150-Watt bulb. Multi-directional lamp head turns 180 degrees to shine full spectrum light exactly where you need it. All metal construction, hand polished finish. 3-year manufacturer?s limited warranty. Product specifications: Weight: 10.8 lbs. Base Diameter: 8.5? Height: 11.5? ? 17.5? Head Dimensions: 8.9?L x 5.4? W x 2.6?H Switch: Three Way Cord Length: 96 inches (8 feet) Diffuser Dimensions: 6.75-in. x 4.9-in. x 0.3-in. Replacement Bulb: 27-Watt Compact Fluorescent - CFML27VLX