Incandescent
       The incandescent also known as the electric light bulb, it works to produce heat when the current through the filament (tungsten filament, the melting point of over 3000 degrees Celsius), a helical filament continually gathers heat makes the filament temperature of 2000 degrees Celsius, the filament in incandescent state, like a red-hot iron can glow as shine. The higher the temperature of the filament, the brighter the light emitted. So called incandescent. Incandescent light, a lot of energy is converted into heat, only a very small part (less than 1%, not calculated) can be converted into useful light energy.

Fluorescent lamps
       Fluorescent lamp is also known as fluorescent light, it works: fluorescent tubes sealed gas discharge tube. The gas argon gas (argon) tube neon neon or krypton krypton) pressure (and the other contains about 0.3% of the atmosphere. Additionally contain a few drops of mercury - the formation of a trace amount of mercury vapor. The mercury atom accounts for about one-thousandth of the proportion of all gas atoms.
Fluorescent tubes are relying lamp mercury atoms released from the gas discharge process UV light (wavelength of 2537 Angstroms = 2537 × 10-10m). About 60% of the electricity consumed can be converted to ultraviolet light. Other energy is converted to heat.
After the release of the fluorescent light from the lamp surface fluorescent substances absorb UV to visible light. Different fluorescent substance emits different visible. Usually ultraviolet light is converted to visible light is approximately 40% efficiency. Thus the fluorescent efficiency of approximately 60% × 40% = 24% - is approximately twice that of the tungsten filament lamp of the same power.

Energy-saving lamps
      Energy-saving lamps also known as compact fluorescent lamps (referred to as the CFL lamp abroad) has the advantages of high luminous efficiency (which is five times that of ordinary light bulbs), significant energy savings, long life (which is eight times that of ordinary light bulbs), small size, easy to use. It works basically the same and fluorescent.
       Energy-saving lamps in addition to white (cold), outside (warm light), and now there are ***. In general, under the same wattage, an energy-saving lamps than incandescent energy saving 80%, the average life expectancy of eight times, only 20% of the thermal radiation. Non-strict case, a 5-watt energy-saving light shines can be regarded as equal to 25-watt incandescent, 7-watt energy-saving light shines approximately equal to 40 watts, 9 watts, approximately equal to 60 watts.

LED lights
       LED lights (Light Emitting Diode), also known as light-emitting diodes, it is a solid-state semiconductor devices, directly to the electric transformed into light. The heart of LED is attached to a bracket on one end of a semiconductor chip, the chip, is the negative side, and the other end connected to the positive power supply, so that the whole wafer is epoxy encapsulated. The semiconductor wafer is composed of three parts, the part of the P-type semiconductor, the hole in it dominant, and the other end is an N-type semiconductor, in the side of the main electronic, the intermediate is typically 1-5 cycles of the quantum well. When the current through the wire in the chip, the electrons and holes will be pushed to the quantum well, electron hole recombination in the quantum well, and will be issued in the form of photons of energy, which is the principle of LED luminous.
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