The Deck Lite Mounting Canister provides an efficient and professional method of luminaire mounting into wood decks. Canister is made of aluminum and is adjustable and suitable for use in varying thicknesses of timber from 3/8 inch to 3 inches. The mounting canister is installed during the rough in stage of construction, avoiding damage to the luminaire itself. The canister holds the luminaire in place by means of two high temperature, heavy duty gaskets and allows installation with no visible screws on the front trim.