Chromalux light bulbs are made of special composition glass containing neodymium, an earth element with unique color enhancing and purification properties. Neodymium absorbs yellow and other dulling components of the visible light spectrum, in turn purifying light and allowing violet, blue, green, and red components to be strengthened, without producing an imbalance of one color over another. Due to its chromatic balance and color discriminating qualities, Chromalux full spectrum light bulbs produce glare free light that helps you concentrate longer with increased visual acuity and greater comfort. Chromalux full spectrum light bulbs reduce eye stress and create a pleasing, colorful, and relaxing environment that enhances people's sense of well being.