All Verilux full spectrum light bulbs are energy efficient and long lasting. Verilux replacement bulbs, like all Verilux energy efficient light bulbs, feature Trucolite Phosphor Technology™, a unique blend of earth phosphors that filter out any imbalance to increase contrast, show true color and reduce glare. Verilux replacement bulbs include Flicker Elimination Technology™ to reduce eyestrain and fatigue. Verilux full spectrum light bulbs fit every Verilux full spectrum desk lamp, floor lamp and light therapy lamp. Our Verilux Natural Spectrum 27 Watt Replacement Bulb (CFML27VLX) provides 10,000 hours of 27 Watt Natural Spectrum™ light. The CFML27VLX bulb can be used in multiple Verilux lamps. New Compact Fluorescent Bulbs (CFL) are the new energy efficient light bulbs that help stop the advance of global warming by using 75% less energy than a traditional incandescent light bulb and our full spectrum light bulbs last up to 10,000 hours. $1 from the sale of CFL Verilux bulbs is donated to national environmental organizations. When you purchase a Verilux Natural Spectrum light bulb you are purchasing the best and most efficient lighting available.