TCP's 48918-65 spiral compact fluorescent light bulbs combine proven TCP performance into a smaller and more efficient design, resulting in better overall lighting performance and long lamp life. All lamps feature end of life circuitry that shuts the bulb off automatically if it senses any lamp starting issues. The ultra high efficiency electronic circuitry optimizes and improves overall system performance and light output, while improved lamp design provides more lighting surface area in a compact space for better light output.