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. 2014 May 30;14:389. doi: 10.1186/1471-2407-14-389

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Copyright © 2014 Nakajima et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Schematic sequences of LED irradiation. (A) Pulse wave (PW) lighting is achieved via peak currents of 1733 mA. (B) Continuous wave (CW) lighting at 400 mA and 100 mA. (C) The irradiation times were 20 min for the 1733 mA (PW) and 400 mA (CW) and it took 40 min for irradiation at 100 mA (CW). Total irradiation dose of these three groups was adjusted to 30 J/cm². (D) Photograph of LED lights, left; 1733 mA (PW), right; 400 mA (CW).