Web enabled Lightening
Web enabled Lightening
Why in News?
- Targeting the upper middle class and middle class in India, lighting solution provider Philips Lighting has launched its latest solution in India.
- The solution termed Philips Hue is an intelligent web-based LED lighting solution with Internet of Things concept, which allows users to control home lighting anytime, anywhere.
- Philips Hue allows users to create and control home lighting using their smartphone or tablet and works seamlessly across both iOS and android mobile platforms.
What is internet of Things
- The Internet of Things (IoT) is the network of physical objects or “things” embedded with electronics, software, sensors, and connectivity to enable objects to be sensed and controlled remotely across existing network infrastructure, creating opportunities for more direct integration between the physical world and computer-based systems, and resulting in improved efficiency, accuracy and economic benefit. Each thing is uniquely identifiable through its embedded computing system
What is LED lighting
- LEDs are semiconductor diodes, electronic devices that permit current to flow in only one direction. The diode is formed by bringing two slightly different materials together to form a PN junction.
- In a PN junction, the P side contains excess positive charge (“holes,” indicating the absence of electrons) while the N side contains excess negative charge (electrons)
- The light is not particularly bright, but in most LEDs it is monochromatic, occurring at a single wavelength.
- The output from an LED can range from red (at a wavelength of approximately 700 nanometers) to blue-violet (about 400 nanometers).
- Some LEDs emit infrared (IR) energy (830 nanometers or longer); such a device is known as an infrared-emitting diode (IRED).
- An LED or IRED consists of two elements of processed material called P-type semiconductors and N-type semiconductors. These two elements are placed in direct contact, forming a region called the P-N junction.
- In this respect, the LED or IRED resembles most other diode types, but there are important differences.
- The LED or IRED has a transparent package, allowing visible or IR energy to pass through. Also, the LED or IRED has a large PN-junction area whose shape is tailored to the application.
What determines the color of an LED?
- The material used in the semiconducting element of an LED determines its color. The two main types of LEDs presently used for lighting systems are aluminum gallium indium phosphide (AlGaInP, sometimes rearranged as AlInGaP) alloys for red, orange and yellow LEDs; and indium gallium nitride (InGaN) alloys for green, blue and white LEDs. Slight changes in the composition of these alloys changes the color of the emitted light.
Benefits of LEDs and IREDs, compared with incandescent and fluorescent illuminating devices, include:
- Low power requirement: Most types can be operated with battery power supplies.
- High efficiency: Most of the power supplied to an LED or IRED is converted into radiation in the desired form, with minimal heat production.
- Long life: When properly installed, an LED or IRED can function for decades.
- Typical applications include:
- Indicator lights: These can be two-state (i.e., on/off), bar-graph, or alphabetic-numeric readouts.
- LCD panel backlighting: Specialized white LEDs are used in flat-panel computer displays.
- Fiber optic data transmission: Ease of modulation allows wide communications bandwidth with minimal noise, resulting in high speed and accuracy.
- Remote control: Most home-entertainment “remotes” use IREDs to transmit data to the main unit.
- Optoisolator: Stages in an electronic system can be connected together without unwanted interaction.