Hello,looking for a replacement in size for my LUXTROL Light Control Type WBD 200. It works well but is only 200 Watts. I need at least 400. It is presently mounted in a metal box imbedded in a plaster dining room wall. The box is 3.375x4.5inches. Has there been an upgrade of the WBD 200 model to handle 400 Watts? And, if so, how can I get my hands on it? Thankyou