The Measurement of Optimal Power Distance in LEDs.
- Author:
Mi Kyung PARK
1
;
Beom Joon KIM
;
Myeung Nam KIM
;
Seog Kyun MUN
;
Hyuck Ki HONG
;
Yeon Shik CHOI
;
Young Chang JO
Author Information
1. Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea. beomjoon@unitel.co.kr
- Publication Type:Original Article
- Keywords:
Healite;
Irradiation distance;
Light-emitting diodes (LED);
Omnilux
- MeSH:
Dermatology;
Enzyme Multiplied Immunoassay Technique;
Light;
Skin;
Skin Neoplasms
- From:Korean Journal of Dermatology
2011;49(2):125-130
- CountryRepublic of Korea
- Language:Korean
-
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(R), (Phototherapeutics Ltd, the UK)) and 830 nm LEDs (Healite(R) (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 Revive(TM) (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.
