... can be used for 100000 hoursSpeed of light-Leonard seconds,light is without delay,and can return frequently. ... No inert Basically. High of lumious efficacy-Light spectrum almost all focused on visible spectrum frequency,without ... Fluorescent lamp,1/3 of the energy-saving lamp,energy-saving rate can reach 90%Durable-Solid light sources, ... shock and vibration,be not broken easily. Ceiling Lamp