Ballast - Replacement for Desk & Floor Lamp, FML27 watt (# BAL27W). Ballast Size: Length - 5.25" (includes mounting tabs); Width - 1.875"; Height - 1.125". Input wires - 2, Output (to bulb) 4 wires. # #ECF-127-120V-LPF. This is replacement ballast for Grandrich desk and floor 27 watt models. May or may not work in other makes. NOT FOR DIMMING LAMPS. Item # BAL27W.