Neewer 50W Cool White & Energy Saving Circline Fluorescent Bulb for Neewer Camera Photo/Video 14"Outer 10"Inner 400W 5500K Ring Fluorescent Flash Light(BULB ONLY) Energy saving circline ring fluorescent bulb for 14"Outer 10"Inner 400W 5500K ring flash light. 50-Watt light source Color Temperature 5500 K Rated Life: 12000 hours Primary Application: Standard