●?Energy Saving - Save up to 50% on your electricity bill when replacing fluorescent tubes by LUMINOSUM 4ft LED tube lights. ●?Bright & High Illumination - Illuminate your space with 2000+ lumens! No annoying flicker and distracting buzz. Energy efficient and environmental friendly. ●?Safe and Long-lasing - With ETL certified, LUMINOSUM LED tubes are safe to use and have a long lifetime of 50,000+ hours. ●?Easy Ballast Bypass Installation - LUMINOSUM 4ft LED tubes are compatible with T8, T10, T12 fluorescent fixtures, just requiring a simple ballast bypass (direct wire) installation.Please watch the video or download the user manual for detailed installation instruction. ●?Your Trusted LED Tube Bulk Supplier - Count on us as your reliable partner for all your bulk LED tube needs, delivering lasting brightness and energy efficiency.