Considering the current background of Low-Carbon Economy (LCE), it has become an inevitable trend to replace high-energy consumption and high-intensity discharge (HID) lights with high-efficiency and energy-efficient LED lights, especially in the field of underwater lighting. In the face of increasing environmental awareness, HID light source has environmental pollution factors, failed to meet the current standards. Furthermore, the source spectrum covers both visible and invisible light wavelengths, and most of the light energy is concentrated in a red wavelength between 600 and 700nm. According to the Rayleigh scattering formula, when light is scattered in an aqueous medium, the luminescence intensity is inversely proportional to the quartet of the incident wavelength. which means that the shorter the wavelength, the luminescence intensity will not be easily decay in the scattering environment. Therefore, the HID light source is inefficient underwater and must use more energy to achieve the required lighting. However, the underwater lighting area does not increase proportionally with increasing power.

Marine engineering and fisheries techniques often involve underwater operations, and underwater lighting is essential. Different underwater operations have different lighting requirements, some requiring moving lighting, some requiring close range lighting, and some requiring remote guided lighting.

Light affects the feeding of animals such as fish, movement, reproduction, etc., so humans will use light sources to trap fish, fish lamp as an important fishing equipment, to help improve fishing production. With the emergence of LED, LED can select specific wavelengths based on the photo biological reactions of specific fish, which is targeted and has obvious advantages over traditional artificial light sources.

LED underwater fish gathering lamp should meet the following requirements: light source has large irradiation range, sufficient illumination, and is suitable for lure fish group; simple and quick start operation; strong, shock resistant, watertight and pressure resistant; durable.

We should also pay attention to the following two points:

Heat Radiation；

Since the energy consumed by LED is almost all heat energy, and can only be transmitted in the form of heat conduction, so the heat dissipation design is the key technology for the successful application of LED. In terms of heat transmission design, the heat capacity of LED device is calculated. The large heat capacity can better absorb and balance the instantaneous thermal impact, and prevent the thermal damage of the LED devices caused by the high temperature caused by the instantaneous over current. The heat transmission balance conditions and transmission amount of the heat sink should also be considered, so that the heat emitted from the LED device inside the fish lamp can be smoothly transmitted to the sea water outside the fish lamp. In the design, the problem of heat dissipation is solved by packaging the base plate. Make the through hole on the heat dissipation substrate, so that the heat dissipation substrate directly contacts with the sea water, so that the sea water circulates in the through hole, to achieve the purpose of cooling.

Package:

The protection level of the LED underwater fish trap lamp is IP68, which requires thorough waterproof and can be immersed in water under a certain amount of pressure for a long time. The LED underwater fish trap lamp lamp body structure shell is made of stainless steel (or aluminum alloy), and the lamp glass is tempered glass, sealed by silicone rubber sealing ring. LED volume is small, flexible packaging, can be arranged into points, lines, surface and other forms of installation. The LED underwater fish collecting lamp using wireless power supply technology can be made into different shapes and sizes, such as spherical shape and straight tube shape.

The LED underwater fish collection lamp can show the images of the fish's favorite food, similar species, and all kinds of things to trap the fish group, and can also show the natural enemies of the fish to drive away the fish group and control the fish group. Implement scientific fishing, rational exploitation and utilization of fishery resources, protect the reproduction of fish, to achieve the goal of sustainable development. The cost of LED underwater fish collecting lamp is relatively high, and the optical flux, consistency and reliability of LED light source still need to be improved.

However, with the continuous development of science and technology and the improvement of various technologies, LED underwater fish collecting lamp will become a main fishing equipment, with a broad application prospect.

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