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? A) Incandescent light bulbs use less energy than either LED or fluorescent bulbs. B) Fluorescent light bulbs are the most energy efficient since their light and heat energy are most equal. C) Incandescent light bulbs rely on heat energy to process light, increasing the light output while decreasing the heat output. D) LED light bulbs provide more light energy while producing less heat energy, making them the most energy efficient of the three types of bulbs.