| dc.description.abstract | This study explores the lateral luminance of long-distance solid-state lighting projectors. LED solid-state light sources were chosen for their advantages in energy efficiency, long lifespan, and high luminous efficacy, making them widely used in indoor and outdoor lighting applications. The characteristics of LEDs were initially analyzed. Through simulation and optimization, we constructed their light source model using the center field fitting method. Based on this model, suitable reflectors and lenses were chosen to create long-distance projection lamps. Under these conditions, a single optical module driven at 7.8W achieved a half-power beam width (HPBW) of 1.45° for the illumination angle, enabling a projection distance of up to 1,181 meters. By arranging the projection lamps in a 4x4 array, the HPBW of the illumination angle was 1.71°, resulting in a projection distance of 4.17 kilometers. A combination of 25 sets of projection lamps achieved a remarkable projection distance of 20 kilometers.
Subsequently, we recorded the arrangement of projection lamps with different lateral quantities and varying elevation angles. We also documented the grayscale distribution of the projection lamps. Data analysis and comparisons were performed based on the measurement results. The experimental outcomes revealed that, under the same projection distance, different lateral arrangements influenced the visual effect at close distances while showing no discernible difference at longer distances.
In conclusion, the results of this study demonstrate that altering the arrangement of projection lamps does not impact the visual contrast at long distances. Moreover, when applying projection lamps in lighthouse scenarios and comparing them with Taiwan′s most intense lighthouse, the Guishan Island Lighthouse, the light intensity was amplified by a factor of 2.22. Additionally, in accordance with IALA regulations, it can project up to 48 nautical miles. | en_US |