Alter Metalyte 2 X 4 Recessed Direct/Indirect Fluorescent 3 LAMP, T8, 5-1/2 in. Deep. Microperforated Mesh Lamp Shield Static. Efficiency 40 percent. Semi-specular aluminum reflectors with lengthwise ridges. Swing down microperforated lamp shield for easy relamping and maintenance. Alter soft white film on inside of mesh conceals lamp image and provide balance between reflected light and direct light. Fully recessed luminaire and lamp compartment. Specular interior reflector. One piece body for easy installation. Easy access to ballast through lamp compartment. Fits standard T-Grid ceilings. Optional acrylic drop-down visual element.