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KMID : 0363220110490020125
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Korean Journal of Dermatology
2011 Volume.49 No. 2 p.125 ~ p.130
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The Measurement of Optimal Power Distance in LEDs
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Park Mi-Kyung
Kim Beom-Joon
Kim Myeung-Nam
Mun Seog-Kyun
Hong Hyuck-Ki
Jo Young-Chang
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Abstract
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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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KEYWORD
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Healite, Irradiation distance, Light-emitting diodes (LED), Omnilux
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