A method is provided for designing an integrated circuit. The assembly includes a housing having a bottom configured for supporting the housing on a surface. The channel accommodates sheaves extending from the barrier and by which a ceiling mounted pulley system may house and lower the barrier with the side frame. In this manner, the load impedance of a current consuming device, such as a light bulb, is used to continuously or intermittently adjusting the current limit of a current driver circuit, such as a lamp driver, to minimize the energy dissipated in case of an overload condition.