Compact Fluorescent Double Twin 4 Pin Lamp, Designation: CFD13W/4P/841, 13 WTT, T4 Shape, G24q-1 G24Q-1 (4-Pin) Base, 15000 HR, Lumens: 900 LM Initial, 4100 DEG K Color Temperature, Cool White 82 CRI, 5-3/16 IN Length