Abstract
We designed a spot light system with an illumination range of 10 km. In the designed system, an appropriate white light-emitting diode (LED) was selected according to the exitance and injection power required. Subsequently, through a first-order optical design, the geometry of the lens and reflector was determined using geometrical calculation. Because the central illuminance of the projection spot of the reflector was 2.5 times that of the cover lens, we first considered the fabrication error of the reflector. According to the adjustment of the optimized distance between the white LED and reflector, we modified the design of the cover lens to fit the new location of the white LED. An LED spot light module containing 16 spot light units was used. The module’s power injection was only 68.2 W. Because of the excellent performance of the designed system in terms of the divergence angle of the projection beam and maximum luminous intensity, which were 1.6° and 2,840,000 cd, respectively, the projection distance of the LED spot light module was 3.37 Km, according to the ANSI regulation. Finally, a spot light system with nine modules and capable of achieving a projection distance of 10 km was successfully fabricated.
Highlights
We found that compared with the other pcW-light-emitting diode (LED), Osram HWQP had
This paper presents the design details of the spot light system and cooler to control the board temperature at 100 ◦ C; the flux was measured using pulse driving results obtained through an experimental evaluation of the system
We found that compared with the other phosphor-converted white LED (pcW-LED), Osram HWQP had a larger exitance calculateand thehigher beam distance, defined distance from the 2luminaire at which thewas measured current injection density as at athe power density of
Summary
White light-emitting diodes (LEDs) have been extensively applied in general lighting and special lighting [1,2,3,4,5], such as stadium [6], museum [7], and workplace lighting [8], thanks to their superior characteristics, including long life, compact size, vivid color, fast response, and environmental benefits [9,10,11,12,13,14,15,16]. Achieving a stable transformation from blue light to yellow light and fixing the color coordinate of the targeted white light are important tasks. Fixing the color coordinate is difficult because the heat generated by the blue die is transferred to the phosphor layer and causes thermal quenching, which reduces the quantum efficiency of the phosphor layer and changes the color coordinate and color temperature [18]
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