Posts Tagged ‘lighting’

Light Bulbs

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Light bulbs have a very simple structure. At the base, they have two metal contacts, which connect to the ends of an electrical circuit. The metal contacts are attached to two stiff wires, which are attached to a thin metal filament. The filament sits in the middle of the bulb, held up by a glass mount. The wires and the filament are housed in a glass bulb, which is filled with an inert gas, such as argon.

When the bulb is hooked up to a power supply, an electric current flows from one contact to the other, through the wires and the filament. Electric current in a solid conductor is the mass movement of free electrons (electrons that are not tightly bound to an atom) from a negatively charged area to a positively charged area.

Electrons constantly collide with the atoms in the filament as the zip through it. The energy produced by each collision vibrates the atoms, which heats them up. A thinner electrical conductor heats up easier and quicker than a thicker one, this is because it has a far greater resistance to electron movement.

Bound electrons inside the vibrating atoms can be temporarily enhanced to a higher energy level and when they receed back to their normal energy level, they release extra energy in the form of photons. Atoms of metal mostly release infrared light, which human eyes cannot see. However if they are heated enough (in the case of a light bulb around 2,200 degrees C / 4,000 degrees F) they will emit lots of clearly visible light.

Within the light bulb itself, the filament is a long, very thin wire of tungsten metal. This is used is very nearly all incandescent light bulbs, and this is because tungsten is simply ideal to use for the filament material. Most other metals would melt under such high temperatures, the structural bonds between the atoms would be broken apart by the vibrations caused by the heat, hence the material becomes liquid. Tungsten is the favoured metal to use in light bulbs because of its high melting temperature. However with that said, tungsten will set on fire when it reaches such extreme temperatures, in the right conditions. Combustion is the end result of two particular chemicals reacting with each other, which occurs when one of said chemicals reaches it’s ignition heat. On earth at least, combustion is almost always a reaction between the atmosphere’s oxygen, and a given heated material, but there are other chemical combinations that will ignite as well. The lightbulb’s filament is encased in a sealed chamber free of oxygen, therefore avoiding combustion. In the early days of light bulbs, a near vacuum was created inside the bulb by sucking out all (or nearly all) of the air, as a result of this, there was barley any oxygen in the bulb, preventing combustion.

The main flaw with this method was that the tungsten atoms were evaporating. At the high temperatures required, occasionally a tungsten atom vibrates heavily enough to seperate itself from the surrounding atoms and launches itself into the air. In the old style vacuum bulbs, the free atoms of tungsten shoot out in straight line and build up on the inside of the glass bulb. As this happens over and over again, the filament is losing atoms and therefore starts to disintegrate, and the glass gets darker and darker as it fills up with atoms. This has a massive effect on the lifespan of a light bulb.

However, in modern day light bulbs, inert gases are used inside them to reduce the loss of tungsten, usually argon. So when an atom of tungsten seperates itself from the filament (evaporates), it is highly likely that it will bounce off an atom of argon and be pushed back towards the filament to rejoin the tungsten structure. Because inert gases are normally unreactive with all other elements, it will not create a combustion reaction within the light bulb.

Incandescent light bulbs give off most of their energy in the form of heat-carrying infrared light photons — only about 10 percent of the light produced is in the visible spectrum. This wastes a lot of electricity. Cool light sources, such as fluorescent lamps and LEDs, don’t waste a lot of energy generating heat — they give off mostly visible light. For this reason, they are slowly edging out the old reliable light bulb.

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Solar garden lighting is the most economical way to touch off your garden and make it a more appealing place to spend time. While it is a lot more cost effective than other varieties of lighting features for outdoors, it also hosts a wide variety of other benefits for your property. You take the time and care to select the perfect plants for your home, and there is nothing better to set it all off than the perfect light features.

When you use the right types of light sources in a garden the overall vibe can be magical. With this type of light you will be able to create whatever type of atmosphere you want as they provide just as much illumination as battery or electric operated lighting.

When you take your energy directly from the sun you will never have to worry about waiting for a technician to run wires underground to link into your home. You can set out your own solar light features with very little hassle or time.

Not only is sunlight all natural and easy to install, but it is completely free for the duration of its life. You will never find yourself adding batteries to the shopping list staring in shock at a much higher electric bill. You get all of the benefits of light in the garden without the running expenses.

Obviously, free energy is an extremely economical solution for light features in your garden. In addition, they are widely available in unique forms.

Most people have at least one decorative statue in their garden. Gnomes are often seen peeking around bushes while small ladybugs are allowed to stroll along the edge of a path. Your choice of figures will bring a little fun and whimsy to your garden while displaying your own personality to your visitors.

Besides appearances and pleasure, consider safety reasons to make your gardens more visible. You may want to sit out on the deck at night and look at your beautiful plants, but you are just as likely to go out for a little walk and inspection in less than ideal lighting situations. These lights will make a path through the garden safer for night and early morning strolls.

Plus, do not forget that setting out a large display of lights is not going to be a time-consuming adventure. You can set them out rather quickly with very little installation and since thanks to the low prices and future savings you may be able to buy more lights than would otherwise be possible.

Right now these products are widely available and reasonably affordable, but the available selection will continue to grow as they become more in demand.

Once you experience the pleasures of using solar garden lighting you may very well find yourself adding other types of renewable energy to your home as well. Not only is using natural light extremely cost effective, but it can increase the attractiveness and the value of your property as well.

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Hanging lights are frequently the center of attention in a room and choosing the perfect piece will be exciting. Hanging lights can be used as direct illumination on a table or island, or you can even make use of it in the form of pendant lighting for more delicate effect.

Chandeliers are another form of hanging light and can add a real sense of class to a room. Chandeliers come in all shapes and sizes now and really appeal to people for their charm. You can’t beat a chandelier over a dining table for instant impact but they’re more than just a center piece, chandeliers produce diffused light around the room.

Lighting like this also produces a relaxed atmosphere with its softer light. It’s perfect for eating or entertaining, which is exactly why you would see them in those situations.

Back to simple forms of hanging lighting: Many people are looking at simpler hanging lighting in modern kitchens because of the good results they give over islands. It makes your kitchen area safer and less prone to dark areas where dirt and pests can hide.

Tiffany hanging lights are used a lot commercially. The light can softly disperse through the small pieces of colored glass. This gives a relaxed ambiance in the bar or restaurant and encourages customers to be more laid back and enjoy themselves. Of course this is good for business as happy relaxed customers will eat and drink more.

Hanging light fixtures can also be used as focal lights for pool or gaming tables either at home or commercially. This is practical and draws the crowd to the entertainment.

Pendant lighting: this type of lighting points the light upward, towards the ceiling. This will provide a soft light to the rest of the room. It can produce a romantic look with the use of mellow lighting. It will as well give a quieter and more comfortable atmosphere. This is nice for a room that you have guests or in a bedroom where you can relax.

Decorative hanging lights are impressive to guest and make an ideal entrance light to your home. A beautiful hanging light sets the atmosphere for your whole home and creates a lasting impression.

Another fun part of hanging lights is their diversity. They can be used in so many ways and for every room in your house. You can have bright LED hanging lights or make use of a dimmer with conventional lights to change the brightness of the lighting. They are especially nice in entertainment rooms and the bedroom, for a warm relaxing atmosphere.

You can use bright hanging lights in offices. This can be decorative as well as sensible and can substitute reading lamps in small offices. You can give a pleasant atmosphere to your office space and keep employee’s moods cheerful.

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