Scrim (lighting)
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A scrim is a device used in lighting for films. It is a small screen that is slot loaded into a light can to lower its intensity. It modifies the light using the same principles as polarizing sunglasses. Scrims are often circular with thin aluminum or steel frame holding the screen together.
Half scrims only have half of the scrim covered with a wire mesh. They only cover half the light, allowing the light source to cast an uneven light. They can be used for finer control over the lighting ratios in a scene.
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