Lenses disperse light to reduce glare and protect bulbs from damage. Cut to size using a band saw or shears.

Egg crate and parabolic lenses have an open construction to allow more light through than solid lenses as well as more air circulation to cool bulbs.

Polystyrene lenses are the most economical, but they may yellow over time. Acrylic lenses won't turn yellow over time. Aluminum lenses withstand higher temperatures than plastic lenses.