| 摘要 |
An underwater lighting unit ( 1 ) for marine or other underwater use incorporates LEDs ( 13 ) as the light source and provides an array of LEDs ( 13 ) mounted against the back wall ( 11 ) of a metal or thermally conductive plastic housing ( 10 ) which utilizes the cooling effect of direct contact between the water and the housing to dissipate the heat generated by the LEDs ( 13 ) in use. The LEDs ( 13 ) each have an associated collimator ( 20 ) protected from contact with the water in which the unit ( 1 ) is to be immersed by a sealed glass screen ( 22 ), and each LED may be from one to three watts or more in power. There may be 30 or more LEDs ( 13 ) and associated collimators ( 20 ) in each lighting unit ( 1 ). The lighting unit ( 1 ) may be mounted in a cofferdam ( 2 ) of a marine vessel, directly against or slightly forwardly of the back wall of the cofferdam, or may be surface-mounted on the hull ( 3 ) of the vessel directly against or slightly spaced from the hull ( 3 ) and below the waterline. |
