Egg crates and grids are essential accessories for any lighting system. A grid alters the shape and intensity of the light output from your Desisti De-Lux 4x55W fluorescent fixture.
Use of an egg crate will result in a narrower spread of light. The spread of light will be determined by the density of the honeycomb mesh, and the distance of the subject from the light. Unless specified otherwise, a grid mounted on a fixture will limit the spread of light to 40° from the face of the light.