Abstract: A self-locking adjustable light fixture comprising an arm, a base, a hood, an arm securing mechanism, and a hood securing mechanism. The arm has an annular shape with interconnecting protrusions at a proximal end and a distal end. The base has mating interconnecting notches that are axially aligned with the interconnecting protrusions of the proximal end of the arm. The base is connected to the proximal end of the arm by the arm securing mechanism which biases the interconnecting protrusions at the proximal end of the arm with the mating interconnecting notches of the base to prevent rotation of the arm. The hood has mating interconnecting notches aligned with the interconnecting protrusions at the distal end of the arm. The hood is connected to the distal end of the arm by the hood securing mechanism which biases the interconnecting protrusions at the distal end of the arm into the mating interconnecting notches of the hood to prevent rotation of the hood with respect to the arm.