GE, F40/CX41/U6/UPC, 6", 40W, Cool White Light Color, White Bulb Color, T12 Shape, U-Bend, Fluorescent Bulb, 6" Leg Spacing, Dimmable, With Dimming Ballast, 2,450 Lumens, 4,100 Kelvin Color Temperature, CRI = 82, 18,000 Hours Rated Life, MOL = 22.5", Individually Bar Coded, Boxed.