Simple Studio 85 watt Fluorescent Photo Bulb - 5500K Daylight Balanced 5950 Lumens Base E27, 5500K Daylight Balanced, CRI 90 Lumens 5950, the highest of all 85w photo bulbs! One foot test: ISO 100, shutter speed 100, Aperture 6.3 with softbox Average life 10,000 hours 1 Year Warranty from defects