A lens is a sheet of plastic (without holes) that fits in the frame of a fluorescent fixture between the lamp and the room below, or a translucent plastic piece (without holes) that wraps around a non-recessed fluorescent fixture.
The most common lenses found in commercial buildings are "Prismatic" lenses. This is the industry standard lighting diffuser found in just about every troffer and surface mount fixture. It combines the maximum efficiency and light spread with low cost for excellent economy & performance.
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R-20 1/16" square prisms in a 45 degree diagonal pattern, low brightness highly efficient/cost effective industry standard available in a variety of stock and custom materials and sizes.
The industry standard. Crystal clear, and non-yellowing for a bright appearance and long life. Available in various thicknesses from .085" to .187" and sizes up to 4' x 8' sheets.
The only choice in vandal-prone and high abuse areas. This heavy duty material can withstand high impacts 10x better than Acrylic but is not as UV stable & willdiscolor with age. Available in thicknesses from .125" to .187"up to 4' x 8' sheets.
The lowest cost material to meet the strictest budgets but will yellow and get brittle with age and UV exposure.
Pattern 12, Pattern 19, Smooth Matte, and Cracked Ice
Acrylic, Impact Modified Acrylic, Polystyrene, Polycarbonate and PETG
Thicknes: .040" to .187"
Width: To 60"
Length: To 110"
Unless specified, 2 x 4 denotes 23 - 3/4" x 47 - 3/4"
Unless specified, 2 x 2 denotes 23 - 3/4" x 23 - 3/4"
Please note: All dimensions are nominal