A feedback control circuit, adapted to control a converting circuit to transform an input power into an output voltage for driving an LED module. The systems and methods separate cellular matter from the plasma by filtration, thereby removing contaminants entrained within the cellular matter. Despite the different forward voltages of red, green, and blue LEDs, RGB modules may be connected in parallel and their control voltages staggered at 60 Hz or greater to generate a single perceived color, such as white. The space inside the ring component allows the dough to rise during cooking without obstruction by the susceptor ring and without imparting thermal energy from the susceptor ring to the dough surface.