... span 50,000 h 1.2M 20W High Brightness T8 led tube light with CE&ROHST8 led tube lightSpecification:Operating temperature: -20 ... heat, no flickering and no UV emissions Low degradation: 10 to 15% light degradation after 10,000 hours for normal 8 ... , hospital lighting, school lighting and so on. Pls feel free to contact us at any time if any problems.