Fish that are drawn to the light of a fish-attracting lamp will gather directly in the illuminated area. Small fish gather in the bright central part. Larger fish and squid, in order to prey on the small fish gathered in the center, will hunt the small fish that are their food from the shadows of the outer area illuminated by the light. Now, the purpose of this use is for glass eels, which are small, thin, and almost transparent fish. If you turn on the underwater light and wait, with LEDs of the same wattage, the total amount of light emitted is considered to be the same, so the total amount of glass eels that gather is considered to be the same. The way the light is shone underwater greatly changes the position and depth of the glass eels that gather. With the same shape as the most commonly used household light bulbs, the LED chips are attached facing directly downwards, and the light is reflected sideways by white frosted glass. In this case, the main axis of light emission is directly downwards. Since they gather the most at the bottom of the bulb (the seabed), the deep water is completely invisible and, of course, cannot be scooped up. Some LEDs have a cylindrical shape with small LED chips arranged 360 degrees around them, but they illuminate the seabed at a 60-degree angle, like a skirt. This also scatters light in wasteful directions, inviting the fish to come where they please. Of course, the glass eels don't notice and get bored and go away. This LED, forcibly, is designed to gather the glass eels only at the depth visible to the person scooping them up, and at a depth where they can be scooped up. The method is to "submerge the LED board diagonally upwards" because the LED's irradiation angle is (60 degrees downwards and 60 degrees upwards), it illuminates horizontally from the water surface to the submerged depth. At 60cm, you can see everything and scoop up everything. At 1m, you can see them, but it becomes difficult to scoop them up. The biggest point is that because it illuminates from the lower front to the upper back, the glare caused by the waves and bubbles on the water surface is all reflected below the surface. Only the light that passes directly through the rough waves and bubbles reaches the person collecting them, so even in rough sea conditions, the underwater scenery comes through clearly. The most popular color is a deep yellow. Power-saving type 12v 50w Operating current 2A / hour Deep yellow LED Power cord: 6.7m The battery clip is a new type that is resistant to rust. Because the structure forcibly gathers the fish in an area at a depth that is fully visible to the person collecting them, it will make a significant difference in the catch when used on the same day and in the same place as other LEDs.