The SPT-SL-824T5 T-5 Fluorescent Clamp-On Task Lamp will deliver brilliant white light that is easy on the eyes and improve the lighting in your room. It features a clamp based for use on any desk or shelf (up to 1.75"" thick) and comes with a 28 inch flexible extension arm. The 27.5 inch wide lamp head allows for better and broader coverage while the flexible arm and lamp head makes the lamp truly versatile and useful. It has a dimmable lighting feature and comes with one energy-efficient T-5 fluorescent bulb. The dimensions of the SPT-SL-824T5 T-5 Fluorescent Clamp-On Task Lamp are Clamp dimensions: 2.75(L) x 1.5(W) inches and unit dimensions (90ø angle): 27.5(W) x 21(D) x 20(H) inches.