Measures 22"L x 0.75"W x 0.75"H in dimension. The bulb itself measures 21 inches long, with end fixtures included it measures 22". You will receive a T5HO strip replacement bulb with 6400K, creating a cool daylight color that mimics the outdoors. It is intended for use with SunPack light stands. Designed to produce pinpoint light energy, this bulb promotes optimal plant production. Perfect for supporting full-term plant growth, allowing your plants to thrive from seedling to maturity. These replacement bulbs make indoor seed starting and gardening a breeze. You can start your seeds when and where you want! SunPack grow bulbs provide high-output full-spectrum lighting to ensure your plants receive the very best conditions for seed starting, growing vegetables, herbs and flowers.