50W 2800lm led ceiling panel light a, Super Thin: 13mm thickness b, High PF: over 0.9 c, High Efficiency: over 85% d, 2 year 50W 2800lm led ceiling panel light 1. Advantage: a, Super Thin: 13mm thickness b, High Power Factor, the PF is over 0.9c, Contant Current Driver: High Effiency of over 85% d, Warranty: 2 yearse, High Lumens of 2800lm, 50W f, Profesional manufacturer of 5 years from 2007. 2) ...