Rosco Ros-1188 Roscolux Tough Frost Light Diffuser Sheet

The Rosco Roscolux Tough Frost (Ros-1188) is a professional light diffusion sheet designed to transform the character of focused lighting instruments. When placed in front of an ellipsoidal or similar hard-edged fixture, it scatters the beam to produce a softer, broader wash of light — effectively turning a spot into a flood or scoop-like source. This makes it invaluable on film sets, television studios, and theatrical stages where controlling light quality is essential to the look of a production.

Measuring 20 x 24 inches, the sheet fits standard gel frames used in professional lighting and can be easily cut down for smaller fixtures. The "Tough" formulation is specifically engineered to endure the sustained heat output of stage lighting instruments, giving it a longer working life than standard frost gels. For lighting designers and gaffers who need reliable, repeatable diffusion without investing in bulkier softbox modifiers, the Rosco Tough Frost remains a go-to solution that delivers predictable results every time.