This 2-pack of F13T5/DL 13-Watt T5 21" fluorescent light bulbs by Bluex Bulbs is perfect for any lighting needs. With a maximum overall length of 21", these bulbs provide an extra long life of 20,000 hours. The 5000K Day Light color temperature provides a bright, natural light that is perfect for any room. These bulbs are energy efficient and cost effective, making them a great choice for any lighting project. With a super long life of 20,000 hours, these bulbs are sure to last for years to come. Get the perfect lighting solution with these F13T5/DL 13-Watt T5 21" fluorescent light bulbs by Bluex Bulbs.