Curved Under Cabinet Light Cover Replacement - White Ribbed Acrylic

In this review the KastLite curved under cabinet light cover replacement is evaluated for homeowners and renovators who need a direct replacement lens. The bottom line: it is best for anyone who wants a low profile, non-yellowing acrylic diffuser that restores even, glare-free undercabinet illumination. The reviewer found the precise dimensions and ribbed exterior deliver consistent light spread, while the durable UV-resistant acrylic keeps the cover clear over time, making it a practical update for kitchen, bathroom and vanity under-counter lights.

Key Features

• Precise dimensions: The 33-5/16in x 2-7/8in x 1-3/8in size fits common undercabinet fixtures and gives a low profile replacement for existing lenses.
• Non-yellowing acrylic: UV-resistant material prevents yellowing and preserves clarity so the light remains bright and consistent over time.
• High light transmission: The cover provides about 92% light transmission, keeping undercabinet areas bright without bulky fixtures.
• Even diffusion: Ribbed exterior and smooth interior combine to eliminate hot spots and glare for a uniform glow across the counter.
• Compatibility and installation: Designed to fit Lithonia and similar brands, it installs by aligning the diffuser with fixture grooves and sliding or clipping into place.
• Sample option available: A sample pack of all 8 shapes in 2in lengths is offered to test fit before ordering a full-length cover.

Who It's For

The KastLite curved lens is ideal for homeowners, handymen, and contractors replacing aged or cracked undercabinet lenses in kitchens, bathrooms and vanity areas who need a clear, stable diffuser that resists yellowing. It is especially useful when even light distribution is desired to reduce task lighting glare on counters and mirrors.

Those who should look elsewhere include buyers who have nonstandard fixtures that do not match the Shape F profile, or anyone who cannot confirm measurements first; returns for incorrect sizing are subject to a restocking fee so measuring carefully or ordering the sample pack is recommended.

Pros & Cons

Pros

• Durable UV-resistant acrylic maintains clarity and resists yellowing over time.
• Ribbed exterior provides smooth, uniform light diffusion that reduces hot spots and glare.
• High light transmission keeps undercabinet areas bright while remaining low profile.
• Fits Lithonia and similar undercabinet fixtures and is simple to slide or clip into place.

Cons

• Fit is size-specific and some customers reported sizing or breakage issues if measurements are incorrect or installation is forced.
• Not a universal shape; users with unusual fixtures may need the sample pack to confirm compatibility.

Specifications

Our Verdict

The KastLite curved under cabinet light cover is a practical, cost-effective replacement for standard undercabinet fixtures when the Shape F profile and measurements match your light. Its non-yellowing acrylic and ribbed design deliver consistent, bright diffusion and a clean appearance; measure carefully or order the sample pack first to avoid sizing issues and potential restocking fees.

Frequently Asked Questions

Will this lens yellow over time?
Answer. The diffuser is made from UV-resistant acrylic designed to resist yellowing and retain clarity.

How do I know it will fit my fixture?
Answer. Confirm the 33-5/16in x 2-7/8in x 1-3/8in dimensions and Shape F profile against your fixture or order the 2in sample pack to test fit.

Is installation difficult?
Answer. Installation is straightforward: align the diffuser with the fixture grooves and slide or clip it into place, but avoid forcing it to prevent damage.