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The positive benefits of UVB\u2010LED lamps over traditional products include greater energy efficiency, freedom from mercury and easy installation without external ballasts. However, the spectra of all the UVB\u2010LED lamps tested had little similarity to the solar UV spectrum. Some lamps emitted short\u2010wavelength, non\u2010terrestrial, radiation known to cause acute photo\u2010kerato\u2010conjunctivitis; we report one case. All lamps were lacking significant output in the range 315\u2013335\u2009nm, essential for natural self\u2010regulation of cutaneous vitamin D<jats:sub>3<\/jats:sub> synthesis, preventing overproduction. We describe a possible risk of serious hypervitaminosis D based on our spectral analysis. We call for long\u2010term animal studies to assess this risk, in which the reptiles under these lamps are exposed to species\u2010appropriate UV index levels according to their Ferguson Zone allocation and serum levels of vitamin D<jats:sub>3<\/jats:sub> and 25(OH)D<jats:sub>3<\/jats:sub> monitored. Spectral modifications of the lamps to make the spectrum more like sunlight may be an essential way of mitigating this risk.<\/jats:p>","DOI":"10.1002\/zoo.21806","type":"journal-article","created":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T10:15:29Z","timestamp":1698056129000},"page":"61-74","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["UVB\u2010emitting LEDs for reptile lighting: Identifying the risks of nonsolar UV spectra"],"prefix":"10.1002","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8553-4551","authenticated-orcid":false,"given":"Sarina","family":"Wunderlich","sequence":"first","affiliation":[{"name":"Licht\u2010im\u2010Terrarium Aalen Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5727-4198","authenticated-orcid":false,"given":"Thomas","family":"Griffiths","sequence":"additional","affiliation":[{"name":"Tomaskas London UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8063-6134","authenticated-orcid":false,"given":"Frances","family":"Baines","sequence":"additional","affiliation":[{"name":"UV Guide UK Abergavenny Wales UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,10,23]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2133.2012.10990.x"},{"key":"e_1_2_7_3_1","first-page":"47","volume-title":"Biology, husbandry, and medicine of the Green iguana","author":"Allen M. 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