AMATRON ETL Listed 16" T9 LED Circline 24W 4100K Cool White Frosted Lens with Non-Dimmable External Powder Driver to Replace 40W 16 inch Fluoresecent Circline Bulb Why buy from AmatronLED ? Because of the following : No Ballast Required. Never need to spend money on Ballast. When you use a 8" 22W fluorescent circline, the actual power consumption will be at least 25W, because the ballast will at least consume 3W. Our UL External Power driver will last at least 5-6 years. After 5-6 years, you may only need to replace the external power driver from us, because the LED circline may last another 5-6 years. Using High quality external isolated UL power driver The product is only as strong as the weakest link. The capacitor decides the life-span of the power driver. The temperature every 10 lower , the power driver's life-span will be doubled one time. This is why it is not good to have internal power driver and LEDs to heat with each other. Trust us ! We are professional LED manufacturer. Our LED Circline provides much higher lumen than Fluorescent Circline. High quality LED + PC lens provides beautiful light with high CRI &gt; 82 !!! No UV or IR. No Mercury or Lead. Eco-Friendly. No Flickering. Shatterproof.