A method for measuring illuminance of a lamp utilizes at least one illuminance meter and a rotary apparatus. The gasket includes a metal core 28 having an embossment formed therein. A search component augments a search query using the contextual information to facilitate customization of a subset of search results based on the contextual information. An evaporated material spouts toward peripheral areas of a substrate due to the inclined evaporation tubes, thereby improving the uniformity of a thin film to be deposited and the efficiency of use of the evaporated material, and preventing condensation of the evaporated material at a spouting portion. In one embodiment, the filter mount is fittable in and removable from a housing of the air cleaner, and comprises a sealing element passing between the main filter and the auxiliary filter.