Light Propagation for Underwater LED as Fish Attraction Lamp

Artificial light in fisheries has been one of the most advanced and successful methods to control fish behavior for capture purposes. This study was conducted to investigate the light propagation and efficiency of the LED fish attracting lamp compared to the traditional light sources like halogen lamps and incandescent light bulbs used fishing. Three colors of LED tubes as the LED fish attracting lamp prototype were constructed, and the optical and electrical characteristics of LEDs were determined. The LEDs tubes consumed electric power of 7.25 W (blue), 6.56 W (green), 3.22 W (red), the incandescent lamp 7.05 W, and the halogen lamp 150 W of electric power. The spectrometer results show that LEDs only emit light in a narrow range of wavelengths, but the light emitted from traditional light sources such as halogen and C4 incandescent dive lamps covered all wavelengths in visible spectrums and also non-visible spectrums. The results in pool measurement showed that the light emitted from the LED tubes was distributed evenly in all directions, and the effective illuminance distance ranged from 2 m to 4 m. The blue light attenuates coefficient value is 1.5 m⁻¹,1.89m⁻¹ for the green light, and red light has the highest at 2.93 m⁻¹. The performance of LEDs in this study shows that they can become a future underwater illuminance light and are worth investigating further.