What are open signs for in business?

Light has long fascinated mankind and man-made light source had gone a long way since Edison. The latest trend of light source belongs to LED, a semiconductor light source that emits light in a far more efficient and cost effective way than lights. What exactly is LED? LED is short for Light Emitting Diode, a color light source that emits color lights based on the movement of electrons in a semiconductor. Different chemicals produce different colors in LED: it can be either infrared or visible.