A diving light for underwater photography comprising: a housing or body containing a battery and electronics, the body being sealed, the body having an intermediate plate at a front of the body and a multi-contact electrical connector exposed at a front of the intermediate plate, a face assembly connected to and removable from the front of the body, characterized in that the face assembly includes a face plate securable against the front of the body and a removable bezel ring retaining the face plate against the body, the face plate including an LED array positioned to project through a window in the face plate, the LED array being sealed within the face plate against water intrusion independently of connection to the body, with a metal core circuit board at a rear side of the face plate and in thermal conductive contact with the face plate, the LED array being mounted on a front side of the metal core circuit board, the face plate being positioned to be in direct contact with water, the face plate, the metal core circuit board and the intermediate plate of the body being configured such that when the face plate is retained on the body with said bezel ring said electrical contacts make connection with the multi-contact electrical connector of the body and the metal core circuit board is spaced away from the intermediate plate to define a cooling space, and including water-admitting openings in the diving light assembly for allowing ambient water to flow into said cooling space to cool the metal core circuit board and the intermediate plate, and an external water-sealed switch on the body for switching the LED light on and off. a housing or body containing a battery and electronics, the body being sealed, the body having an intermediate plate at a front of the body and a multi-contact electrical connector exposed at a front of the intermediate plate, a face assembly connected to and removable from the front of the body, characterized in that the face assembly includes a face plate securable against the front of the body and a removable bezel ring retaining the face plate against the body, the face plate including an LED array positioned to project through a window in the face plate, the LED array being sealed within the face plate against water intrusion independently of connection to the body, with a metal core circuit board at a rear side of the face plate and in thermal conductive contact with the face plate, the LED array being mounted on a front side of the metal core circuit board, the face plate being positioned to be in direct contact with water, the face plate, the metal core circuit board and the intermediate plate of the body being configured such that when the face plate is retained on the body with said bezel ring said electrical contacts make connection with the multi-contact electrical connector of the body and the metal core circuit board is spaced away from the intermediate plate to define a cooling space, and including water-admitting openings in the diving light assembly for allowing ambient water to flow into said cooling space to cool the metal core circuit board and the intermediate plate, and an external water-sealed switch on the body for switching the LED light on and off.