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. Parabolic lenses are reflective to direct light downward, which reduces glare.

Polystyrene lenses are the most economical, but they may yellow over time.