Abstract: A light-filtering apparatus is provided for attachment to a dental lamp. The apparatus includes a filter that blocks out light having a 350 to 550 nanometer wavelength. A spring-loaded roller is configured to carry the filter. A second roller may also be provided. A window-like frame is attached to a center of rotation of either the spring-loaded roller or the second roller. A tab is attached to the filter and is configured to place the filter in front of the dental lamp when the tab is pulled by a user. Essentially, the apparatus functions in a manner similar to a window shade for alternately blocking out and allowing light to shine on either a composite resin or another light-curable material that is being placed in a dental patient's mouth.