The Working Principle of LED Bulbs

December 14, 2014 by Sarah Longfellow

FacebookTwitterGoogle+PinterestTumblrStumbleUponLinkedInBlogger PostDeliciousDiggShare

Here Now I am introducing a new product and the name is LED H7 Bulb. LED means light emitting diode. LEDs are a solid state device and do not require heating of a filament to create light. Rather, electricity is passed through a chemical compound that is excited and that generates light. LEDs are not bulbs or lamps in the true sense of the word and application. LEDs require a lot of work to make them ready to be used by the consumer. They need to be placed on a circuit board or other material that will allow electricity to pass through it at a specific voltage and current, and with components required to operate them at specific voltages such as 12vdc, 24vdc or 120vac. They do not come ready to plug into a 12volt or 120 volt power source
led h7 bulbThis is a very simple explanation of the construction and function of LEDs. White LEDs need 3.6VDC and use approximately 30 milliamps of current, a power dissipation of 100 milliwatts. The positive power is applied to one side of the LED semiconductor through a lead (1 anode) and a whisker (4). The other side of the semiconductor is attached to the top of the anvil (7) that is the negative power lead (2 cathode). It is the chemical makeup of the LED semiconductor (6) that determines the color of the light the LED produces. The epoxy resin enclosure (3 and 5) has three functions. It is designed to allow the most light to escape from the semiconductor, it focuses the light (view angle), and it protects the LED semiconductor from the elements. As you can see, the entire unit is totally embedded in epoxy. This is what make LEDs virtually indestructible. There are no loose or moving parts within the solid epoxy enclosure.
Its works include Perfect for Daytime Running Light, Fog light and Driving light. Since the nature of the item being offered might fit a large variety of different vehicle and function. Please make sure this is the correct application type of bulb before placing order. The base of this H7 LED bulb was too large for the H7 socket on my vehicle. I tried another H7 bulb and it would fit perfect. These may work in another application. The price is certainly great

• easy to replace
• simple construction
• different dimensions
• cost effective
The working principle of an LED is quite hard to explain, but in short words, they rely on negative electrons moving against positive “holes” across a semiconductor. When a free electron falls into a hole that sits on a lower energy level, it will loose its energy which is released as a photon (the tiniest fraction of light) in a process called electroluminescence.

Multiply this process thousands of times per second and you have a continuous bright light being emitted from something about 2 mm wide – a light emitting diode (LED).

The most important aspect when it comes to LED Bulbs is the fact that they need very low power to work compared to classic halogen bulbs. LEDs are for instance used on Toyota Prius models and on a couple of other hybrids on which electricity plays a key role – not necessarily for the Bulb.

Leave a Reply

Your email address will not be published. Required fields are marked *