The measurement of optimal power distance in LEDsThe Measurement of Optimal Power Distance in LEDs
- Authors
- Park, M.K.; Kim, B.J.; Kim, M.N.; Mun, S.K.; Hong, H.K.; Choi, Y.S.; Jo, Y.C.
- Issue Date
- Feb-2011
- Publisher
- 대한피부과학회
- Keywords
- Healite; Irradiation distance; Light-emitting diodes (LED); Omnilux
- Citation
- Korean Journal of Dermatology, v.49, no.2, pp 125 - 130
- Pages
- 6
- Journal Title
- Korean Journal of Dermatology
- Volume
- 49
- Number
- 2
- Start Page
- 125
- End Page
- 130
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/21877
- ISSN
- 0494-4739
- Abstract
- Background: The use of light technology in dermatology has grown rapidly over the last decade, with many developments in its use for the treatment of a wide variety of skin conditions from non-melanoma skin cancers to facial resurfacing for photo-damaged skin. Light-emitting diodes (LEDs) have attracted much attention in medical fields. Objective: (1) To assess the optimal distance of 630 nm LEDs (OmniLux®, (Phototherapeutics Ltd, the UK)) and 830 nm LEDs (Healite® (Lutronic, Korea)) for maximum power as determined by a power meter and (2) to apply theory to practical use. Methods: Two separate hinged planar light emitting diode arrays were studied: 1) the Omnilux ReviveTM (Phototherapeutics Ltd, the UK), which delivers non-coherent red light at a wavelength of 633±3 nm and 2) the Lutronic Healite (Korea), which delivers non-coherent light at a wavelength of 830±5 nm. An X93 power meter (Gigahertz-Optik, Germany) was placed against a black background in order to reduce the amount of reflected light. We measured the LED powers over a range of 3-25 cm in 1 cm increments. Results: On the irradiation side of the LED, power increases according to the mass effect of the radiation angle. However, at a certain distance, the power decline effect predominated over the amassment effect. In this respect, the LED light was estimated to be emitted in a reverse V shape. The proper irradiation distance for use in medical fields can thus be determined. Conclusion: The proper irradiation distance of LED will be useful and the proper use of LED under the subjects' shape will be done in many medical fields.
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