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The aim of this study was to show how the illuminance that reaches the target skin area during SDL\u2010PDT depends on the spatial positioning of the patient.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In this technical validation study, illuminance from the SDL\u2010PDT system IndoorLux\u00a9 was measured at different angles, directions, and distances from the light sources corresponding to potential target skin areas. Using two different photometers, data from 63 measuring points at seven specific distances from the ceiling were collected at 0\u00b0, 45\u00b0, and 90\u00b0 angles, respectively. Illuminance levels \u226512,000 lux were regarded as adequate. Hotspots were defined as adequate measurements in all directions at a specific measuring point at distances of 1.3, 1.5, and 1.8\u00a0m from the light sources (i.e., the most common patient treatment positions).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Adequate illuminance levels were more common with photometer 1 (73%) than photometer 2 (57%). Almost all illuminance levels were adequate at a 0\u00b0 angle with both photometers. Adequate illuminance levels were observed at 82\u201393% of the measuring points at a 45\u00b0 angle and 22\u201347% at a 90\u00b0 angle. Hotspots were registered with both photometers at all measuring points at 0\u00b0; 59\u201379% of the measuring points at 45\u00b0; and 0\u201321% at 90\u00b0.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Patient positioning is important during SDL\u2010PDT. Adequate illuminance is achieved if target skin areas are positioned at 0\u00b0\u201345\u00b0 angles relative to the light sources, but not at 90\u00b0 angles.<\/jats:p><\/jats:sec>","DOI":"10.1111\/phpp.12792","type":"journal-article","created":{"date-parts":[[2022,4,19]],"date-time":"2022-04-19T07:39:53Z","timestamp":1650353993000},"page":"564-570","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Measurements of illuminance in simulated daylight photodynamic therapy"],"prefix":"10.1111","volume":"38","author":[{"given":"Alexandra","family":"Sj\u00f6holm","sequence":"first","affiliation":[{"name":"Department of Dermatology and Venereology Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg  Gothenburg Sweden"},{"name":"Department of Dermatology and Venereology Sahlgrenska University Hospital  Gothenburg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magdalena","family":"Claeson","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Venereology Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg  Gothenburg Sweden"},{"name":"Department of Dermatology and Venereology Sahlgrenska University Hospital  Gothenburg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Paoli","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Venereology Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg  Gothenburg Sweden"},{"name":"Department of Dermatology and Venereology Sahlgrenska University Hospital  Gothenburg Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,4,30]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/jdv.16017"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.2340\/00015555-1101"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/phpp.12394"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/lsm.22827"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2133.2008.08450.x"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.23736\/S0392-0488.18.05907-2"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/bjd.15146"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1468-3083.2011.04386.x"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2133.2012.11200.x"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/bjd.13138"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijms17030309"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/bjd.13420"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamadermatol.2015.5436"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pdpdt.2021.102692"},{"key":"e_1_2_10_16_1","unstructured":"Swiss Red AG.A new concept: Simulated Daylight PDT (SDL\u2010PDT) with IndoorLux\u00a9.https:\/\/indoor\u2010lux.com\/#concept. 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