A simulation system is described for computing the overall signal generated in a substrate by a digital system comprising a plurality of gates associated with the substrate, wherein each gate is configured to perform a switching event. In this regard, a representative system, among others, includes a processing device that facilitates execution of programs stored in the image processing device and memory that is electrically coupled to the processing device. The first light emitter has a first light-emitting direction. A second luminescent material has a maximum light emission wavelength within a range of 510 nm to 610 nm. Each power conductor layer includes a pair of positive and negative terminal vias for one phase of the electric current connected to selected outer vias.