A Spectrally Dynamic Berth Light for Active Circadian Cycle Management

Navy and other armed service personnel frequently encounter environmental conditions that upset the natural circadian rhythm and would profit from a light that offers corrective management. The feasibility of a new berth light will be studied. It will meet the standard requirements but also have spectral, timed, controlled and intense enough light to affect the human circadian system. The advantages of solid state light emitting diodes will be utilized. Built in controls will provide ease in implementing fixed time exposures of bright light and/or “dawn simulation” (i.e. a gradual increase in light prior to waking). These exposures have shown efficacy in circadian modification. Special attention will be paid to the potential use of blue light because of its dominant circadian affect. However, if excessive - it could pose a potential eye hazard, so it will be carefully considered. We will also analyze the alternate use of green light. Tests will be conducted on assembled light configurations to identify their illumination patterns and intensities. The exposures to subjects will be predicted. Thermal management effectiveness will be determined. Results will clarify feasibility and provide information for building prototypes in Phase II.