Technically speaking, LED is a p-n junction diode which emits light when sufficient voltage is supplied to its ends. Diode is a semi conducting device which allows the energy in one direction. In case of LEDs, it not only allows the electrical energy to flow in uni direction but also converts the electrical energy into light energy. LED bulbs consume less power when compared to CFL, incandescent, Halogen and other regular bulbs. LEDs are available in different types and sizes which can be used for different purposes. Some LEDs are application specific such as in photo flash, traffic light indicators, alphanumeric displays, remote controls, motor vehicles and bicycle lights etc.
Types of LEDs
Based on the light emitting capacity and size, LEDs are classified into three types.
- Miniature LEDs
These are available in small sizes and required less power. The miniature LEDs are widely used in cell phones, calculators, and remote controls.
- High power LEDs
High power LEDs are used in applications where high intensity light is required. The high powered lights are typically used in automotive, domestic and in industrial applications.
Eco-friendly Nature of LEDs
- Light is a combination of electro magnetic waves. Depending on wavelength the spectral regions are classified. Among them, UV and Radio frequency waves are unsafe and hazardous. UV rays may cause cancer and skin problems whereas high exposure to radio waves can affect cellular structure of human as well as plant bodies. On contrary, LEDs are safe to use because the light emitted by them is ecofriendly.
- LED light do not attract bugs and insects like other light sources.
- Mercury and lead are very poisonous metals. These metals are typically used in traditional lights such as fluorescent and incandescent bulbs. But in LEDs, the diodes are made of semi-conductor materials which are eco friendly metals. So, LEDs are easily recyclable because they are free from mercury, lead and phosphorus.
How LEDs are useful?
LEDs have everyday used in domestic life, infrastructure, auto mobiles, technical gadgets etc.
In domestic life we use LEDs for lighting rooms, TVs, remote controls, etc.
Coming to housing infrastructure to decorate walls and buildings in a specific manner
In automobiles LEDs are used in head lights, brake lights etc.
In cell phones,calculator, PH meters and in many technical gadgets
LEDs for Growing Plants
We all know that for photosynthesis of plants, light is essential. The light from the sun is a mixture of 7 colours (VIBGYOR) with different wave lenghts. LEDs provide artificial lighting when natural sun light is low or to provide the sole source of lighting for growing plants indoor. The main LED color spectrum required for plant growth is –
Red light LEDs (630- 660 nm) : For growth of stems and for expansion of leaves red light is essential. It regulates the flowering, seed germination, and dormancy period.
Blue Light LEDs (400- 520 nm) : This wave length affects the chlorophyll content present in the plant and also thickness the leaves
Green Light LEDs (500-600nm): This wave length penetrates on the top leaves to support the bottom leaves. Now a days due to
Now a days due to over population many people live in apartments. In most of the apatments, the chances of getting good ventilation is very low. With the help of different colors of LED lights they can grow plants of their choice inside their apartments.