in Comfort. The OttLite 508 Illumination 13-Watt replacement tube -LRB- physics ballast -RRB- the right-hand mix of brightness and contrast to bring apodeictic colors and cozy clarity to your world so you can enjoy your time flat more. You 'll colors accurately so you can make selections with gross confidence. And, you 'll see okay print and details with ease under this unequaled inferior heat, inferior glare that helps reduce eyestrain. The output of a 13-Watt OttLite tube is roughly to that of a 60-Watt light bulb. So, they about 1/4 the amount of energy for the similar amount of Light. However, it 's not simply about, it 's also about the timber of the Light. Here to learn more. NOTE : This tube has an natural philosophy ballast and is designed to work exclusively with in for OttLite lamps. Please our information page to make indisputable you 're purchasing the discipline 13-Watt Tube. Failure to purchase the discipline tube may the durability and performance of your purchase. If you have any questions, contact customer service -LRB- 800-842-8848 -RRB-. For just F48, 783003 and KCY008 lights purchased after January 2008. Model T13330A to be put-upon for lamps purchased antecedent to January 2008.