An egg crate is a square or rectangular grid accessory used on large open-face light sources to control light spread, reduce glare, and shape overall light output.
In professional lighting systems, an egg crate functions as a light-control component that limits off-axis light while allowing the primary beam to pass through with minimal obstruction. The grid structure resembles the pattern of an egg carton, which is where the term originates. Each cell in the grid acts as a directional channel, restricting the angle at which light exits the fixture.
Egg crates are commonly used in commercial and industrial lighting environments where controlling stray light is critical to visual clarity and comfort. By narrowing the effective beam angle, an egg crate helps reduce unwanted spill light that can cause glare, reflections, or uneven illumination across large spaces. This makes them especially valuable in environments with sensitive visual tasks, large open areas, or mixed lighting zones.
Unlike diffusers, which scatter light in multiple directions, egg crates focus on directional control rather than softening output. This distinction allows lighting designers and system engineers to maintain intensity and contrast while improving control. Egg crates are often paired with other optical accessories to fine-tune performance without significantly altering the color temperature or core brightness of the light source.
From a system-level perspective, egg crates contribute to predictable lighting behavior. Consistent control over beam spread supports uniform visual conditions across commercial facilities, performance spaces, and industrial environments. Their grid geometry also makes them adaptable to a range of fixture sizes and formats commonly used in professional lighting systems.
Also known as a light control grid.
Sometimes referred to as a honeycomb grid.
While egg crates themselves are not typically governed by standalone regulations, their use aligns with lighting performance considerations outlined by organizations such as IES and ANSI. These bodies influence best practices related to glare reduction, visual comfort, and controlled illumination in professional environments.
The egg crate concept evolved alongside theatrical and architectural lighting as fixtures increased in output and beam width. Early lighting systems often produced excessive spill, prompting the need for mechanical light control methods. Grid-based accessories emerged as a practical solution, offering repeatable and reliable control without complex optics. Over time, egg crates became a standard accessory in professional lighting inventories due to their simplicity and effectiveness.