A novel light source with tuneable uniformity of light distribution for artificial daylight photodynamic therapy

Paul O'Mahoney, Neil Haigh, Kenny Wood, C. Tom A. Brown, Sally Ibbotson, Ewan Eadie

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
124 Downloads (Pure)


Objectives: Implementation of daylight photodynamic therapy (dPDT) is somewhat limited by variable weather conditions. Light sources have been employed to provide artificial dPDT indoors, with low irradiances and longer treatment times. Uniform light distribution across the target area is key to ensuring effective treatment, particularly for large areas. A novel light source is developed with tuneable direction of light emission in order to meet this challenge.

Methods: Wavelength composition of the novel light source is controlled such that the protoporphyrin-IX (PpIX) weighed spectra of both the light source and daylight match. The uniformity of the light source is characterised on a flat surface, a model head and a model leg. For context, a typical conventional PDT light source is also characterised. Additionally, the wavelength uniformity across the treatment site is characterised.

Results: The PpIX-weighted spectrum of the novel light source matches with PpIX-weighted daylight spectrum, with irradiance values within the bounds for effective dPDT. By tuning the direction of light emission, improvements are seen in the uniformity across large anatomical surfaces. Wavelength uniformity is discussed.

Conclusions: We have developed a light source that addresses the challenges in uniform, multiwavelength light distribution for large area artificial dPDT across curved anatomical surfaces.

Original languageEnglish
Pages (from-to)144-150
Number of pages7
JournalPhotodiagnosis and photodynamic therapy
Early online date18 Jun 2018
Publication statusPublished - Sept 2018


  • Actinic keratosis
  • Light source
  • PDT
  • Photodynamic therapy
  • Uniformity

ASJC Scopus subject areas

  • Biophysics
  • Oncology
  • Dermatology
  • Pharmacology (medical)


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