LED light bulb is an electric light for use in light fixtures that produces light using one or more light-emitting diodes. LED bulb have a lifespan many times longer than equivalent incandescent lamps, and are significantly more efficient than most fluorescent lamps. LEDs come to full brightness immediately with no warm-up delay.
Surveillance of the public using CCTV is common in many areas around the world. Use of video cameras to transmit a signal to a specific place, on a limited set of monitors. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in law enforcement.
An LED display is a flat panel display, which uses an array of light-emitting diodes as pixels for a video display. Their brightness allows them to be used outdoors where they are visible in the sun for store signs and billboards. LED displays are capable of providing general illumination in addition to visual display, as when used for stage lighting or other decorative purposes.