---
product_id: 61471347
title: "Beam Lighting 21” L-Shape Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser | 20-7/8” Length x 2-7/8” Width x 1” Height (Please Check The Size is Correct Before Ordering)"
brand: "beam lighting plastics your diffuser source"
price: "€ 42.04"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.fr/products/61471347-beam-lighting-21-l-shape-under-cabinet-light-cover-replacement
store_origin: FR
region: France
---

# UV-stabilized non-yellowing acrylic Precision 20.875" length fit Proudly American made quality Beam Lighting 21” L-Shape Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser | 20-7/8” Length x 2-7/8” Width x 1” Height (Please Check The Size is Correct Before Ordering)

**Brand:** beam lighting plastics your diffuser source
**Price:** € 42.04
**Availability:** ✅ In Stock

## Summary

> 💡 Illuminate your space with flawless clarity and American craftsmanship!

## Quick Answers

- **What is this?** Beam Lighting 21” L-Shape Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser | 20-7/8” Length x 2-7/8” Width x 1” Height (Please Check The Size is Correct Before Ordering) by beam lighting plastics your diffuser source
- **How much does it cost?** € 42.04 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/61471347-beam-lighting-21-l-shape-under-cabinet-light-cover-replacement)

## Best For

- beam lighting plastics your diffuser source enthusiasts

## Why This Product

- Trusted beam lighting plastics your diffuser source brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** UV-stabilized, non-yellowing acrylic guarantees long-lasting clarity and durability—no yellow haze, ever.
- • **Made in the USA:** Crafted with pride and precision domestically, supporting quality standards and local craftsmanship.
- • **Snap-In Installation:** Effortless, tool-free snap-in mounting saves time and hassle—upgrade your lighting in minutes.
- • **Perfect Fit Every Time:** Engineered to match 21" under cabinet fluorescent fixtures for seamless replacement.
- • **Crystal Clear Diffusion:** Ribbed acrylic design ensures even, glare-free light distribution to elevate your workspace ambiance.

## Overview

This Beam Lighting 21” L-Shape Under Cabinet Light Cover Replacement features a 20-7/8” x 2-7/8” x 1” white ribbed acrylic diffuser designed for optimal light diffusion and durability. Made in the USA with UV-stabilized, non-yellowing acrylic, it fits multiple 21-inch fluorescent fixtures and installs easily with a snap-in design, ensuring a perfect, long-lasting upgrade for your under cabinet lighting.

## Description

Beam Lighting 21” L-Shape Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser | 20-7/8” Length x 2-7/8” Width x 1” Height (Please Check The Size is Correct Before Ordering)

## Features

- REPLACEMENT LENS FOR 21 INCH UNDER CABINET / UNDER COUNTER FLOURESCENT LIGHT: High quality 21 inch (20-7/8 inch nominal length) white acrylic replacement lens cover diffuser for under cabinet fluorescent fixture. Fits several different Lithonia fixtures plus many others.
- 100% ACRYLIC NON-YELLOWING FORMULA FOR LONGEVITY: These lenses have ribbing on the outside for maximum light diffusion, and are UV stabilized to prevent yellowing.
- QUALITY AMERICAN MADE PRODUCT: Our lenses are manufactured here in the USA and are made to the same specifications as the covers on the original fixture, and are far superior to cheap imported replacements.
- THIS LENS MEASURES: 20-7/8 inch length x 2-7/8 inch width x 1 inch height (will fit 21 inch light fixture).
- NOT SURE ABOUT SIZING? : A Beam Lighting Plastics Expert is just a phone call or email away.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | BEAM Lighting Plastics Your Diffuser Source |
| Color | White |
| Material | Acrylic |
| Shape | Corner |
| Special Feature | American made quality |
| Finish Type | Linear Ribbed |
| Style | Classic |
| Mounting Type | Snap In |
| Number of Pieces | 1 |
| Assembly Required | No |
| Manufacturer | BEAM Lighting Plastics Your Diffuser Source |
| UPC | 685642995923 |
| Part Number | ULC21 |
| Item Weight | 2.39 ounces |
| Product Dimensions | 21 x 3 x 1 inches |
| Item model number | WS-320 |
| Is Discontinued By Manufacturer | No |
| Finish | Linear Ribbed |
| Power Source | Corded Electric |
| Voltage | 0.01 Volts |
| Installation Method | Snap in |
| Type of Bulb | Fluorescent |
| Plug Format | A- US style |
| Switch Style | Push Button |
| Special Features | American made quality |
| Usage | Residential |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** BEAM Lighting Plastics Your Diffuser Source
- **Color:** White
- **Material:** Acrylic
- **Shape:** Corner
- **Special Feature:** American made quality
- **Finish Type:** Linear Ribbed
- **Style:** Classic
- **Mounting Type:** Snap In
- **Number of Pieces:** 1
- **Assembly Required:** No

## Images

![Beam Lighting 21” L-Shape Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser | 20-7/8” Length x 2-7/8” Width x 1” Height (Please Check The Size is Correct Before Ordering) - Image 1](https://m.media-amazon.com/images/I/615keupV9RL.jpg)

## Questions & Answers

**Q: That is what I need....but I need 36"....do you have that?**
A: The Amazon link below is for our 33 inch lens, you can order that one and send us a request to custom cut your lens to 36 inches.

https://www.amazon.com/dp/B06Y3CKHNH?ref=myi_title_dp

**Q: How is it instalked?**
A: Installation is easy, it just snaps in.

**Q: Will this product fit a luminaire under cabinet light that is appropriately 3 in wide**
A: The measurements of this cover are correct on the product page. also this cover is flexible so it will bend a little to install.  Yes it will fit a 21X3X1 light that has lip edges to hold it in place (all lights do have them that is why it says 2 and 7/8 size not 3.  I is very good quality--installs easily and diffuses light properly.  I am very pleased with this cover.

**Q: Do you have a 21" T8 fluorescent bulb**
A: No, I have a 21 T5.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect fit
*by G***T on June 19, 2025*

Was pleasantly surprised at the perfect fit in a 20-year old fixture.

### ⭐⭐⭐⭐⭐ Fits my 21” Luminaire under cabinet lamp perfectly!
*by P***9 on August 14, 2024*

I had to purchase this lamp cover because the original one was brittle and broke during the last bulb change. The material used in this cover seems sturdier than the one that came with the lamp from the factory. The small gaps at the ends are the same width as the original cover, so there are no issues there. The installation was easy, and the light shines through perfectly.

### ⭐⭐⭐⭐⭐ Lens for light under the cabinet.
*by D***N on April 29, 2025*

This lens fit great!

## Frequently Bought Together

- Beam Lighting Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser (L-Shaped, 21")
- Beam Lighting 42-3/8” L-Shape Under Cabinet Light Cover Replacement | White Ribbed Acrylic Diffuser | 42-3/8” Length x 2-7/8” Width x 1” Height
- (6 Pack) F13T5/CW - T5 Fluorescent 4100K Cool White - 21" Linear - 13 Watt T5 - Under The Counter Light Bulbs

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-03-16*