Product Description OTTLITE-TrueColor Replacement Bulb. The bulb is great for using in a lamp while you are reading crafting or in the office. Use this bulb in the TC10050 TC10819 TC10001 and the TC 10179. This package contains one 13W replacement bulb. Imported. From the Manufacturer The OttLite 508 Illumination 13 watt replacement tube delivers the right mix of brightness and contrast to bring true colors and comfortable clarity to your world so you can enjoy your time even more. You’ll see colors accurately and fine print and details with ease under this unique low heat, low glare illumination that helps reduce eyestrain.