half spiral energy saving lamp:9W, 11W, 13W, 15W; T3(9-10mm), 110-230V, 2700K/4000K/6500K, 8000H high quality. half spiral energy saving lamp:Power: 9W ... , 11W, 13W, 15Wtube diameter: T3(9-10mm)Color temperature (K): 2700K ... assurance system. We have CE&EMC, RoHS and ISO9001 certifications. half spiral energy saving lamp