LED ABC

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What is LED filament?

An LED Filament light bulb is an electric light bulb which produces light with a LED that is shaped as a filament. The light bulb is supplied with electric current by feed-through terminals or wires embedded in the glass. Most bulbs are used in a socket which provides mechanical support and electrical connections.

The LED filament is composed of a series of LEDs on a transparent substrate, referred to as Chip-On-Glass (COG). These transparent substrates are made of glass or sapphire materials. This transparency allows the emitted light to disperse evenly and uniformly without any interference. The COG material is then coated with an even coating of Phosphor material.

Compared to other LED lights, LED Filament lights are omni-directional. The filament comprises a strip of LEDs that are set in a fluorescent compound.

led-vs-cfl

LED VS CFL

If you’re still on the fence over which energy-efficient alternative to choose, you’re running out of time. Incandescent bulbs are being phased out and will be a thing of the past by next year. Since lighting our homes accounts for about one-quarter of our electric bills, the new energy-efficient bulbs are going to save us money in the long run. But which should we choose?

LED Advantages
LED lights last longer, so even though you’re paying more at purchase, you buy fewer bulbs over time. These bulbs fit in standard light fixtures with no adaptor necessary. LED makes very nice lighting for effect and decorative purposes.

LED Disadvantages
LED lights generally cost more to buy than CFLs, but manufacturing technologies are lowering these prices continually. These lights are directional, meaning they are excellent for lights under cabinetry, but not as suitable to table lamps. Some of the newer LED lights come with diffusers, which helps some.

CFL Advantages
CFL, or compact fluorescent, is simply a mini version of a standard fluorescent light bulb, However, these bulbs fit in standard light sockets without any adaptor. The light appears much like the incandescent light we’re used to, and looks nothing like the harsh lighting we associate with offices or school buildings.

CFL Disadvantages
The primary disadvantage to CFL lights is the mercury contained in the bulb. This is ordinarily not a problem, but if the bulb breaks clean up is a hassle. Mercury is a dangerous heavy metal, and proper cleanup and disposal of CFL bulbs is critical. Never put a used CFL bulb in with the rest of your trash. Contact your local waste management company to learn how to properly dispose of used CFL bulbs.

Making Your Decision
Most people make the decision between LEDs and CFLs with their pocketbook. LED costs more at purchase, but lasts longer. CFLs are cheaper, but if broken become not so convenient very fast. Other people decide that CFL lighting is closer to what they’re used to and therefore choose these bulbs to replace incandescent bulbs as they blow out.

Both are efficient ways to light your home, and both work with all the sockets, lamps and fixtures you already own. If you enjoy a directional light for reading, cooking, or working at home, you might prefer the LED bulbs. For general home lighting, such as illuminating a room, CFL might be best.

Of course, you can always use a combination of these technologies in different parts of your home according to the lighting needs in different rooms. This is also a good way to compare the lights to decide. Try some LEDs in the kitchen over your workspaces and over the home office desk. Use CFLs in the living room and bedroom lamps. In time, you may develop a preference, or find you like one for certain applications and the other for other activities.

Whichever you choose, your deadline for deciding is rapidly approaching. By 2014, incandescents will no longer be manufactured in the U.S.

introduction-of-led-art

INTRODUCTION OF LED ART

LED Art is form of light art constructed from light-emitting diodes. Many artists that use LEDs are guerrilla artists, incorporating LEDs to produce temporary pieces in public places. LEDs are very inexpensive to purchase and have become a new way to make street art. LEDs are, among others, used in installation art, sculptural pieces and interactive artworks. See more introduction of LED Art from WIKI

LED lights intrduction

LED INTRODUCTION

Light Emitting Diode (LED) is a relatively old technology, circa 1970, that has advanced from numeric displays and indicator lights to a range of new applications, including exit signs, accent lights, task lights, traffic lights, automobile lighting, signage, wall sconces, and outdoor lighting and downlighting.

LEDs offer benefits such as small size, long lamp life, low heat output, energy savings and durability. They also allow extraordinary design flexibility in color changing, dimming and distribution by combining these small units into desired shapes, colors, sizes and lumen packages.

Characteristics
LEDs are solid state semiconductor devices. LED illumination is achieved when a semiconductor crystal is excited so that it directly produces visible light in a desired wavelength range (color). LED units are small, typically 5mm (T 1-3/4).

Method of Operation
When an LED unit is activated, a power supply converts AC voltage into sufficient DC voltage, which is applied across the diode semiconductor crystal. This results in electrons (negative charge carriers [N]) in the diode’s electron transport layer and holes (positive charge carriers [P]) in the diode’s hole transport layer combining at the P-N junction and converting their excess energy into light. The LED is sealed in a clear or diffuse plastic lens that can provide a range of angular distributions of the light.

Color
The color composition of the light being emitted by the LED is based on the chemical composition of the material being excited. LEDs are available that can produce colors including white, deep blue, blue, green, yellow, amber, orange, red, bright red and deep red.

Efficacy
LEDs are low-voltage, low-current devices and efficient light sources. For red, amber, yellow, green and blue LEDs, new materials have been developed that are more efficient than traditional materials, producing efficacies (lumens per watt) greater than incandescent lamps and rivaling fluorescent lamps. A. Efficacies as high as 100 LPW have already been achieved in laboratory conditions. According to Steve Johnson, group leader of lighting research for the Lawrence Berkeley National Laboratory, “It is not unrealistic to expect the efficacy of solid-state sources to achieve 150-200 lumens per watt in the coming decades.”

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Energy Saving of LED

Electric lighting burns up to 25% of the average home energy budget.

The electricity used over the lifetime of a single incandescent bulb costs 5 to 10 times the original purchase price of the bulb itself.

Light Emitting Diode (LED) and Compact Fluorescent Lights (CFL) bulbs have revolutionized energy-efficient lighting.

CFLs are simply miniature versions of full-sized fluorescents. They screw into standard lamp sockets, and give off light that looks similar to the common incandescent bulbs – not like the fluorescent lighting we associate with factories and schools.

LEDs are small, very efficient solid bulbs. New LED bulbs are grouped in clusters with diffuser lenses which have broadened the applications for LED use in the home. LED technology is advancing rapidly, with many new bulb styles available. Initially more expensive than CFLs, LEDs bring more value since they last longer. Also, the price of LED bulbs is going down each year as the manufacturing technology continues to improve.