Hey looks like a rubber maid container Im using the blue one just like that, I suggest covering the lid and sides of the container Im not sure about the silver/grey one but the blue one "leaks" light. Because your using a 400watt hps I strongly suggest covering/painting/taping that box because the light is bright. But good luck it looks like you have a nice little setup I have the exact same thing going except im using a 400watt Metal halide