PROBLEM TO BE SOLVED: To provide stable formulations comprising a fully human IgG4 anti-LIGHT (receptor expressed by T lymphocytes) antibody.SOLUTION: Liquid drug product formulations and lyophilized drug product formulations comprises a LIGHT antibody or a binding agent binding to LIGHT, 4.5-55 mM of a citrate as a buffer, and a polysorbate, where the pH of the formulation is at or below pH 6.SELECTED DRAWING: None