T8 elliptic shell instructions:Is round with a built-in power supply, can match the transparent PC cover, small diffusion: PC cover, transparent, striped PC cover, transparent, diffusion stripe PC cover.With T8 is round screw lamp holderLuminous transmittance of transparent PC cover 94-96%Diffusion PC cover transmittance 85-88%Japan teijin or mitsubishi PC raw materialsAnodizing aluminum using 6063 - T8, surfaceAdvantage: no light, no dark space, see light bead, high light transmittance, no grain