Use cri â?¥ 90 with high brightness low blue light spill light source, high color purity, no harmful to the teenagers cornea. Tubes come with bright view technologies (bvt) light management, more efficient lighting technologies for ugr < 19 No flicking light power, keep the eyes from fatigue for a long time. High quality pc cover, soft light, super-wide illuminated area, no dark and anti-glare No dark spots, uniform luminance, beam angle Built-in isolated power supply, branded components, outstanding design and processing technology, ensure stable long-time work 50000hours usefull life Ce/rohs/fcc certificated Application: School, classroom, museum