Butterfly DD 28 Watt Daylight 6400k Compact Fluorescent Lamp ideal for applications where a compact energy saving and efficient light source is required. The 28 Watt output of this 4 Pin GR10q lamp is the equivalent of a 100W incandescent bulb. DD lamps are very popular lighting sources designed for use with external control gear. This bulb is well suited to ceiling and surface fixtures security and wall sconce applications due to its shallow compact shape.