An injection mold assembly for a high output consumer product injection molding machine, the injection mold assembly having a simplified cooling system. The sheet has a recovery force of 0. A marginal discount associated with each item processed is generated. In addition, the substrate and the electrodes are made of a transparent material to transmit light therethrough, so that the light source using the LED radiates light in all direction as in the light source using the arc discharge, without shielding the light at a rear side by the electrodes.