Light bulbs transform electrical energy to light energy. no energy transformation is 100%. thus, in the transfer from electrical energy to light energy, some energy is dissipated as heat. the efficiency of an electrical device depends on: 1. how much energy is wasted ‐ transferred to unwanted stores 2. how much energy is transferred to useful stores the more energy a device wastes, the less efficient it is. the graph shows the efficiency of three types of light bulbs: incandescent, fluorescent, and led. what can you conclude about the energy efficiency of the light bulbs?