What the fuck just happened? Anyways I would be quite hesitant at running an HPS light in a rubbermaid grow box. 6 CFL's(138w) puts out plenty heat, a 400w HPS is gonna bake your plant in a rubbermaid. Basically I would think it would be better to either construct a new grow cab for an hps, or stick with CFL's in your rubbermaid.