... : 20w; 3.Light efficiency:>58lm/w 4.Ra>82. half spiral CFL light tube:1. Tube diameter:12mm;2. Power: 20w ... efficiency:>58lm/w4.Ra>82.5.Color temperature:6500K. Description:full spiral CFL light tube:1.)Save 80% energy more than incandescent ... .Application: Home, Offices, Shops, Department Stores, Clubs, Restaurants, Hotels, Supermarkets full spiral CFL light tube/CFL tube