A submersible light assembly comprises at least one light source and a watertight housing having a base, at least one sidewall and a transparent envelop enclosing a portion of the light source. The base incorporates two concave indentations set substantially orthogonal to each other to substantially conform to the profile of the surface profile pilework of the type associated with a jetty, such that the light assembly can be placed against the pilework in any one of four configurations.