What are LEDs in LED Light Towers?Simon
Lumax LIghts uses LEDs to provide the most efficient LED Light Tower solutions on the market. Below is some technical information on LEDs. You will also find information on how to judge lumens/watt and eventually fuel consumption per lumen.
LED (Light-emitting diodes) lights are P-N junction semiconductor devices, used to emit light. When an electric current is passed through them, they emit light. They work only when current flows in forward direction and stop working when the direction of current is reversed. They are highly efficient lighting devices and have a long life. They can emit multicolored lights of colors ranging from infrared to ultraviolet. LEDs are compact, making them ideal for a wide range of operations.
What is P-N junction?
P-N junction diodes are formed when p-type and n-type semiconductors pr placed in contact with each other. P-type or positive semiconductors are extrinsic semiconductors, doped with atoms that can accept electrons hence they have holes or positive charge as their majority charge carriers. N-type or negative semiconductors are extrinsic semiconductors, doped with atoms that can donate electrons hence they have electrons or negative charge as their majority charge carriers.
When electric current passes through LED, the electrons in the N-type region and the holes in the P-type region combine. When the electrons combine with holes, the atom becomes stable and energy is released in the form of photons. This phenomenon is called electroluminescence. The amount of energy released in the form of photons is responsible for the color of the light emitted.
The working principle of LED can be explained by quantum theory, according to which energy is released when an electron falls from a higher energy level to a lower energy level. The released energy is equal to the energy gap between the two levels (namely the conduction band and the valence band, respectively). This released energy, in the form of photons, is responsible for emitting light.
Advantages of LEDs:
- They are compact
- They are highly energy efficient
- They are cost-effective
- They do not require warm-up time
- They have a long lifetime
Applications of LED:
- LEDs are used in bulbs for home or office lighting
- They are used in the display of electronic devices like mobile phones, televisions, etc.
- They are used in headlights and taillights of cars and bikes
- They are used in traffic signal lights
- They are used in floodlights, street lamps, etc.
Types of LEDs:
- High output LEDs- They require high current for operation and have high luminosity
- Miniature LEDs- They are very small LEDs used for producing backlight on LCD displays
- AC-driven LEDs- They can operate on AC input without a DC converter
- Bi-color LEDs- They have two different colored LED emitters enclosed in one case
- RGB tri-color- They contain three different LEDs (red, blue, green) in one case
- COB (chip on board)- They produce a denser amount of light compared to the surface mounted device