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OttLite Natural Lighting replacement bulbs and tubes deliver the right mix of brightness and contrast to bring true colors and comfortable clarity to your world. You’ll see colors accurately and fine print and details with ease under this unique low heat, low glare illumination that helps reduce eyestrain. This bulb is to be use with Ott lights that have magnetic ballasts with tube type A. Fits lamps 58337R, TL13MAG and TL13TCG.