🌐EnglishEnglishDeutschFrançaisItalianoNederlandsPortuguêsРусский日本語EntityQ1767471· pop 13· linked from 21 articlesintegrating sphereAlso known as Ulbricht sphereOptical componentWikidata factsImageLuminance Chamber.jpgSources (3)wikidata.orgdocs.openalex.orgweb.archive.orgvia Wikidata · CC0Available in 12 languagesFrançaisDeutsch日本語РусскийPortuguêsItalianoBulgarianCatalanCzechHungarianConnectionsradiometryEntityLambertian reflectanceEntityCategoriesLaser scienceOptical devicesPhotometry