{"id":52,"date":"2021-01-25T19:57:25","date_gmt":"2021-01-26T00:57:25","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/chapter\/efficacy\/"},"modified":"2021-04-21T14:41:23","modified_gmt":"2021-04-21T18:41:23","slug":"efficacy","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/chapter\/efficacy\/","title":{"raw":"Efficacy","rendered":"Efficacy"},"content":{"raw":"This term refers to how efficient a light source is at converting electrical energy into Luminous Flux<\/strong>. It is the ratio of how many lumens<\/strong> are created for a given watt<\/strong> of electrical power consumed.\r\n

[latex]{Efficacy} =\\frac{lumens}{watt}[\/latex]<\/p>\r\n \r\n\r\nAt 100% efficiency 1 watt of electrical power would produce 683 lumens.\r\n\r\nSome light sources are more efficient at creating illumination than others. The standard i<\/strong>ncandescent<\/strong> lamp has a very poor efficacy at around 20 lumens per watt, with most of the energy consumed wasted as heat.\r\n\r\nCommon fluorescent<\/strong> lamps have an increased efficacy ranging between 50 to 100 lumens per watt. All lamp efficiency ratings will vary by manufacturer. While fluorescent<\/strong> lamps are more efficient, they require additional equipment in the form of ballasts<\/strong> to operate, and the efficacy rating must include all losses due to heat in either the lamp, ballast or other associated control equipment.\r\n\r\nRecent improvements in LED<\/strong> lighting technology are making many older lighting systems obsolete. LED\u2019s are extremely efficient at producing illumination, with some LED\u2019s approaching 150 lumens per watt. LED\u2019s will also require auxiliary equipment in the form of a driver<\/strong>, which will also affect their efficiency ratings. Combined with long life, low electrical power consumption and good colour rendition, it\u2019s easy to see why LED\u2019s<\/strong> are often the first choice for new lighting installations.\r\n\r\nAs a general rule any time that energy is transformed in some fashion, there is a loss of energy wasted in the form of heat.\r\n\r\n\"\"\r\n\r\n \r\n\r\n ","rendered":"

This term refers to how efficient a light source is at converting electrical energy into Luminous Flux<\/strong>. It is the ratio of how many lumens<\/strong> are created for a given watt<\/strong> of electrical power consumed.<\/p>\n

\"{Efficacy} =\frac{lumens}{watt}\"<\/p>\n

 <\/p>\n

At 100% efficiency 1 watt of electrical power would produce 683 lumens.<\/p>\n

Some light sources are more efficient at creating illumination than others. The standard i<\/strong>ncandescent<\/strong> lamp has a very poor efficacy at around 20 lumens per watt, with most of the energy consumed wasted as heat.<\/p>\n

Common fluorescent<\/strong> lamps have an increased efficacy ranging between 50 to 100 lumens per watt. All lamp efficiency ratings will vary by manufacturer. While fluorescent<\/strong> lamps are more efficient, they require additional equipment in the form of ballasts<\/strong> to operate, and the efficacy rating must include all losses due to heat in either the lamp, ballast or other associated control equipment.<\/p>\n

Recent improvements in LED<\/strong> lighting technology are making many older lighting systems obsolete. LED\u2019s are extremely efficient at producing illumination, with some LED\u2019s approaching 150 lumens per watt. LED\u2019s will also require auxiliary equipment in the form of a driver<\/strong>, which will also affect their efficiency ratings. Combined with long life, low electrical power consumption and good colour rendition, it\u2019s easy to see why LED\u2019s<\/strong> are often the first choice for new lighting installations.<\/p>\n

As a general rule any time that energy is transformed in some fashion, there is a loss of energy wasted in the form of heat.<\/p>\n

\"\"<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"author":103,"menu_order":3,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["alee59"],"pb_section_license":"all-rights-reserved"},"chapter-type":[],"contributor":[61],"license":[58],"class_list":["post-52","chapter","type-chapter","status-publish","hentry","contributor-alee59","license-all-rights-reserved"],"part":42,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/users\/103"}],"version-history":[{"count":5,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/52\/revisions"}],"predecessor-version":[{"id":428,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/52\/revisions\/428"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/parts\/42"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/52\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/media?parent=52"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapter-type?post=52"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/contributor?post=52"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/license?post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}