Abstract
Light Emitting Diode (LED) phototherapy (SEDRA 811) luminaire from Medical Engineering Group ( MEG) was improved after the collaboration between the R&D group of MEG and National Institute for Standards (NIS). The initial LED luminaire consists of 10 Blue super LEDs which provide irradiance levels of 332 to 5719 µW/cm 2 ±4.5% distributed over the effective surface area (treatment bed). The uniformity of these irradiance levels were 0.06 at the total effective area and 0.2 at central area. A new
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