All discussions made so far were\nbased on the assumption that the luminous intensity or the candle power from a source\nis uniformly distributed over the surrounding surface.<\/p>\n\n\n\n
But none of the practical type of\nlamp provides light uniformly distributed in all directions because of its\nunsymmetrical shape.<\/p>\n\n\n\n
It is often necessary to know the\ndistribution of light in various directions to ascertain how the candle power\nof a light source varies in different directions.<\/p>\n\n\n\n
The luminous intensity in all the\ndirections can be represented by polar\ncurves.<\/strong><\/p>\n\n\n\n If the luminous intensity in a\nhorizontal plane passing through the lamp is plotted against angular position,\na curve known as horizontal polar curve<\/strong>\nis obtained.<\/p>\n\n\n\n If the luminous intensity in a\nvertical plane is plotted against the angular position, a curve known as\nvertical polar curve<\/strong> is obtained.<\/p>\n\n\n\n The typical polar curves<\/strong> for an ordinary filament lamp<\/p>\n\n\n\n The polar curves<\/strong> are used to determine the mean horizontal candle power\n(M.H.C.P.) and mean spherical candle power (M.S.C.P.).<\/p>\n\n\n\n These are also used to determine the\nactual illumination of a surface by employing the candle power in that\nparticular direction as read from the vertical polar curve in illumination\ncalculations.<\/p>\n\n\n\n The mean horizontal candle power of a\nlamp can be determined from the horizontal polar curve by taking the mean value\nof the candle powers in a horizontal direction.<\/p>\n","protected":false},"excerpt":{"rendered":" All discussions made so far were based on the assumption that the luminous intensity or the candle power from a source is uniformly distributed over the surrounding surface. But none of the practical type of lamp provides light uniformly distributed in all directions because of its unsymmetrical shape. It is often necessary to know the […]<\/p>\n","protected":false},"author":1,"featured_media":549,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[157,156],"class_list":["post-548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-engineering","tag-filament-lamp","tag-luminous-intensity"],"_links":{"self":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/548","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/comments?post=548"}],"version-history":[{"count":2,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/548\/revisions"}],"predecessor-version":[{"id":2363,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/posts\/548\/revisions\/2363"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media\/549"}],"wp:attachment":[{"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/media?parent=548"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/categories?post=548"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zillionsbuyer.com\/blog\/wp-json\/wp\/v2\/tags?post=548"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}