Verilux Natural Spectrum Desk Lamp with Flexible Gooseneck, In-base USB and 2-prong Outlet Natural Spectrum light illumines with greater contrast and true color rendering Read faster with greater comprehension & study longer without glare, eyestrain and fatigue Flexible EasyFlex Gooseneck positions light exactly where needed while Optix lens diffuses light Convenient in-Base 1 amp USB port and polarized AC outlet Replacement Bulb: Verilux CFS13GU24VLX 13 Watt CFL