Kinglumen Brightest 18 Watt 4 Foot T8 LED Tube Lights, 45w Fluorescent Tube Replacement Kinglumen No flickering, no buzzing ballast High efficiency (100 lumen per watt) Environment friendly - no mercury or hazardous materials 3 Year Warranty CRI &gt; 85 Power Factor&gt;0.95 Ideal for all energy saving application