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Archive for June, 2010

About GU10 LED Light Bulbs

29 Jun

What are GU10 LED light bulbs?
You may have seen the new LED light bulbs that have sprung up welding machinein the last few years in all the department stores, this is not only because of the benefits to the environment these new energy saving bulbs bring but also because of the highly reduced cost of using LED (light emitting diode) instead of standard halogen and tungsten filament bulbs. Well LED (light emitting diode) bulbs are a new low energy alternative to halogen and tungsten filament bulbs.

Benefits of LED light bulbs:
LED light bulbs are incredibly energy efficient over halogen bulbs saving 80 to 90 percent energy. GU10 LED run cooler so they do electric jacknot lose energy via heat. They can be run in many colours from daylight white to Amber, Orange, Pink, Red, Cyan, Blue, Royal Blue, Green and many more.

Some applications LED Lighting can be used:
Residential Lighting, Commercial Lighting, Accent Lighting, Reading Lights, Display Lighting, Desk Lamps, Business Lighting,compression fittings Walkway Lighting, Illuminant Lighting, Hotels, Bars, Night Clubs and many more.

GU10 LED light bulbs are a great replacement for 20-35W twist-lock halogen bulbs that run extremely hot, this is because GU10 Light Emitting Diode bulbs run alot cooler. Not only do LED bulbs run alot cooler but they also last 20 times longer than your standard halogen light bulbs and use up to 80 percent less energy,high power isolator what this translates to is a massive saving in energy costs if you make the switch to these energy effecient bulbs.

Where can you use GU10 LED bulbs in your home?
Well if you were to list the types of lighting that can be found in rooms such as Living rooms, dining rooms kitchens, bathrooms, bedrooms, hallways and basements then you will so that the majority of the lighting can now accept energy effecient LED light bulbs. Some of the types of lighting that you can apply the LED bulbs to are spot lights, accent lighting tracks and clusters, recessed down lights, security lighting, courtesy lights, desk lamps, decorative feature lighting and many more.

Do GU10 LED bulbs cut it when it comes to emitting enough light?
In Oil paintingregards to luminosity and the quality of light, LED (light emitting diode) light bulbs on balance deliver a much cleaner, sharper light than standard halogen light bulbs and offer far more flexibility when it comes to colour choice and brightness.

Post from: oilpainting.jesusfreak.de

 

Are LED Light Bulbs Better Than CFL Bulbs For Eco-Friendly Lighting?

29 Jun

LED light bulbs have been used for a decade in many of the applications including the formation of the numbers on digital clocks, forming the images on the large outdoor television screens, used in the watches, mobile and even it is used for the traffic lights. The led light bulbs are based on the semiconductor diode and emits low intensity red light, and the modern version are available with the visible, ultraviolet and infrared wavelengths with very high intensity and brightness.

Due to its compact size, LED has allowed new text, video displays and sensors to be developed. These infrared LED light bulbs are also used in the remote control units and other commercial products including the televisions, DVD players and other domestic appliances. And, it has even been observed that, LED bulbs serve many advantages over incandescent light which includes lower consumption of energy, longer life span, and smaller size, durable and reliable.

It has even been observed that LED light bulbs offer more efficient technology than incandescent lamps and CFL’s, as Led bulbs solely depend upon the movement of electrons. And, unlike incandescent, they do not have the filament that would burn out and more than this, it does not contain mercury or other toxic substances. And, also led can last up to 60 times longer than incandescent and 10 times longer than CFL’s. LED bulbs even use a higher percentage of electricity for generating light.

Some of the other features of LED light bulbs include:

Efficiency: LED produces more light per watt than incandescent bulbs and their efficiency is not affected by the shape and size, unlike other CFL bulbs.

Color: LEDs generally emits light without using the color filters that traditional lighting methods require. And, this in turn makes it more efficient and lowers the initial costs.

Size: LEDs are normally designed very small and they are even smaller than 2 mm and are embedded into the circuit boards.

On/Off time: LED bulbs operates and functions very quickly. A typical red indicator LED achieves its full brightness within a microsecond. And, that’s why it is used for communication purpose.

Cycling: LED are also ideal for using in the applications that are subjected to frequent on-off cycling, as the fluorescent lamps burns out quickly when they are frequently cycled and requires a long time before restarting.

 
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Plant Growth and Indoor Lighting

27 Jun

Indoor gardening makes a great hobby, especially during the gloomy and cold winter months, where in many areas of the country outdoor gardening of flowers and vegetables is out of the question. Hydroponics gardening is a popular method used by indoor gardening enthusiasts. Hydroponics is a form of soilless gardening; it instead uses a growing medium (or not, depending on the style of hydroponics you choose) in which the plant roots sit, and they are fed through the application of a nutrient solution. There are a few basic supplies you will need to get started with hydroponics gardening, including a lighting system including grow lights, a ballast and reflector. You might need growing medium, and you will definitely need nutrient. The amount and kind of nutrient and growing medium you need will depend on the specific plants you wish to grow. You can start plants yourself from seed, or you can purchase plants from nurseries and greenhouses. Grow lights are vital to your success because without proper lighting your plants will not grow and thrive. Indoor lighting of your plants affects plant growth in several different ways.

The visible spectrum is the part of the light spectrum that we can see. This spectrum is represented in wavelengths and is measured in the Kelvin scale. The spectrum ranges from purple and blue on one end, greens in the center, and orange and red on the other end.

Daylight ranges from 5000 to 6500 K. What all this means to the indoor gardener is this: you are trying to replicate outdoor sunlight in an indoor setting. Plants grown indoors need 12-16 hours per day under appropriate lights in order to grow well. The kind of plants you are trying to grow will also play a part in the type of grow light you choose to use. Grow lights that emit light in the blue spectrum are best for use in plants in which you want to promote vegetative growth, such as seedling plants or lettuces, for example. If you are growing flowering plants, or fruiting vegetables such as tomatoes, you will instead want to use lighting that offers red/orange spectrum light. Light in this range is best for promoting flowering and fruiting in plants. Once you know what type of plants you wish to grow, then you can obtain the appropriate lighting for them to flourish.

There are many great HID lights, or high-intensity discharge lights, that work well in an indoor gardening application. They include HPS grow lights, or high pressure sodium lights, and metal halide grow lights. Because of the lower cost yet great light output, many indoor gardeners also like LED grow lights with light-emitting diodes as well.

Post from : newsbowl.org

 
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Led Grow Lights: Tips For Successful Plant Growth

27 Jun

Growing flowers, plants and vegetables with LED lights is a balance of multiple variables including proper and correctly timed nutrition, precise watering, correct room temperature and proper LED lighting coverage design. If you are a veteran gardener this is already known. If you are new to this fascinating world of greenhouse or indoor gardening do not get overwhelmed. Achieving this balance of growth factors is the fun part and should not be stressful. Growing healthy and beautiful plants will be the outcome of patiently adjusting these parameters.led grow lights

Here are some LED grow light tips to take the guess work out of successful plant growth with LEDS:

- LED grow lights can be placed closer to the plants because of the low heat that the fixtures produce. Always, move your lights closer slowly (over days) and check your plants regularly for any type of heat stress.

- When talking with your supplier ask for light coverage specifications or a lighting coverage design before you purchase LED grow lights.

- Plant type, room size, other lighting sources and budget are all factors to be considered before purchasing. Any reputable distributor or retailer should be able to do this for you. If you are a commercial grower this lighting design can be very helpful in assisting you determine return on investment.

- Watering has to be adjusted with LED grow lights because the soil is not being “baked” by lights that produce high heat amounts. We suggest at least using an inexpensive soil dampness meter if you are growing in soil.

- Monitor before changing to LED grow lights so you have a baseline for your water use. Hydroponic growers will also see less water used also but this level is easier managed because of the centralized water/nutrient source.

- Along with watering be watchful of nutrients levels given to the plants under LED grow lights. The environment is gentler and may need fewer nutrients by the plants to achieve the same amount of growth.led plant growing lights

- Environmental conditioning needs to be adjusted because the heat created by LED grow lights LED is less than conventional grow lighting. Room temperature for proper plant growth needs to be a in a certain range for the plants you choose to grow. As a general rule plants optimally grow and flower at temperatures between 68F to 86F.

Post from:newsbowl.org

 
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A Brief Talk on How LED Emits Color Light

24 Jun

The factors that affect the light color and light-emitting efficiency of LED are the materials and manufacturing process of LED, red, green and blue are widely used currently. Because the working voltage LED is low (only 1.5-3V), it can emit light spontaneously and has certain brightness, and the brightness can be adjusted by voltage (or current), and it also features impact-resistant, anti-vibration, long lifespan (100,000 hours). Different manufacturing materials of LED can generate photons with different energies in order to control the wavelength of light emitted from LED, which means spectrum or color.

the material used to manufacture the first LED in the history is arsenic (As) of gallium (Ga), its PN junction forward voltage drop (VF, can be understood as lighting or working voltage) is 1.424V, and the light it emitted was infrared spectrum. Another commonly used material for LED is phosphorus (P) of gallium (Ga), its PN junction forward voltage drop is 2.261V, and the light it emits is green light.

Based on these two kinds of materials, the early LED industry used GaAs1-xPx material structure, which in theory can produce LEDs with any wavelength within the range from the infrared light to green light, subscript X stands for the percentage of phosphorus to replace arsenic. Generally LED’s wavelength and color can be determined through the PN junction voltage drop. There are some typical LEDs such as GaAs0.6P0.4 red LED, GaAs0.35P0.65 orange LED, GaAs0.14P0.86 yellow LED and so on. Since the three elements of gallium, arsenic and phosphorus are used to manufacture these LEDs, they are commonly referred to as three-element light emitting tube.

And GaN (gallium nitride) blue LED, GaP green LED and GaAs infrared LED are commonly referred to as two-element light emitting tube. The latest manufaturing process utilizes four-element LEDs with four-element material which mixes aluminum (Al), calcium (Ca), indium (In) and nitrogen (N), which can contain the spectrum range of all visible light and some ultraviolet light.

Luminous intensity: there are three light intensity measurement units, unit of illuminance (Lux), luminous flux unit (Lumen) and luminous intensity unit (Candle power) 1CD (candlelight) means under the freezing point temperature of platinum, the total radiation objects’ luminous intensity of every sixtieth square centimeter area. (also means the luminous intensity of a diameter 2.2 cm, 75.5 gram whale oil candle which is burning 7.78 grams per hour with a flame height of 4.5cm along the horizontal direction). 1L (lumen) means the luminous flux of 1 CD candle light lighting in the distance of 1 cm on a 1 square centimeter plane.

1Lux means the illuminance generates when 1L of luminous flux evenly distributed on the area of 1 square meter. Generally active luminophor use luminous intensity unit CD, such as incandescents, LEDs and so on; reflection or transmission type of objects use Luminous flux unit Lumen, such as LCD projector and so on; and illumination unit Lux is generally used in photography and other fields. Three types of measurement units are equivalent in value, but we need to understand from different perspectives. For example: If an LCD projector brightness (luminous flux) is 1600 lumens, the projecting size to the total reflection screen is 60 inches (1 square meter), and its illuminance is 1600 lux, we assume the distance from light source to the light exit is 1 cm, the light exit area is 1 square centimeter, and the light intensity of the light exit is 1600CD. But as a matter of fact LCD projectors’ brightness will be adversely affected because of the loss of light transmission, reflection or translucent film loss and uneven distribution of light, 50% efficiency is a normal or good result.

In actual use, the light intensity calculation often utilizes the unit which is easy to measure. for the active luminophor LED display we generally use CD/square meter as the unit of luminous intensity with the observing angle as auxiliary parameters, which is equivalent to the illumination unit lux of the screen surface; multipling this value with the effective display area of the screen will generate the luminous intensity of the whole screen in the visual angle, Suppose luminous intensity of each pixel in the corresponding space of the screen body is constant, and this value can be considered as the luminous flux of the whole screen. Only when common outdoor LED screens achieve a brightness of 4000CD/square meter or more should they have ideal display effect under the sun. The maximum brightness of common indoor LED is around 700 ~ 2000 CD/square meter.

Single LED luminous intensity use CD as unit with visual angle parameters, LED luminous intensity has nothing to do with LED color. Luminous intensity of Single LED varies from several mCD to 5000mCD. Luminous intensity given by LED manufacturers means the point in the best visual angle and in the center position with the maximum LED luminous intensity when the LED is lit up under 20mA current. The shape of the lens on the top and the distance between the top lens and LED chips determines the beam angle and light intensity distribution of LEDs when packaging LEDs. Generally speaking, for the same LED, the bigger the beam angle is, the smaller the maximum luminous intensity is, but the accumulated luminous flux on the surface of the whole three-dimensional hemisphere is constant. When the several LEDs are arrayed closely and regularly, their lighting spheres will overlap, which will result in even luminous intensity distribution on the whole light-emitting surface.

When calculate the luminous intensity of the screen, the luminous intensity value of the maximum point shall be multiplied by 30% to 90% accroding to the visual angle of LEDs and array density of LEDs, which can be considered as the average light intensity of single LED. Generally LEDs have a long lifespan, and manufacturers always mark that the lifesapn is more than 100,000 hours,  actually we should also pay attention to LED brightness degradation cycle, such as majority of the UR LEDs for automotive taillights have only the half brightness as before after lighting for dozens of hours.

The manufacturing process of LED material affect LED brightness degradation cycle a lot, if economic condition permits we should select four-element LEDs with a slow brightness degradation cycle. White is a mixed color of red, green and blue according to the brightness proportion, When the brightness of green in the light is 69%, the brightness of red is 21%, the brightness of blue is 10%, the human eyes feel pure white after mixing the colors. But the color coordinate of the red, green and blue LEDs unable to achieve the effects of full chromatograms because of manufacturing process and other reasons, and controlling the brightness of primary colors including biased primary colors to generate white light is called matching colors. Before matching colors for the full-color LED display screen, in order to achieve the best brightness and lowest cost, we should choose the LEDs whose luminous intensity proportion of the three primary colors is around 3:6:1 to compose pixels.

White balance requires that the color mixed by three primary colors under the same gray adjustment value is still pure white. Primary colors, fundamental colors: the basic colors that can synthesize a variety of colors. The primary colors in the color light are red, green and blue.

The red, green and blue light that LED emits, according to their different wavelengths characteristics, can be sorted into purple red, pure red, orange red, orange, orange yellow, yellow, yellow green, pure green, jade green, blue green, pure blue, blue purple and so on, orange red, yellow green and blue purple are much cheaperthan pure red, pure green and pure blue. Green is the most important among the three primary colors, because green accounts for 69% of the brightness in the white color, and it locates at the center of the color horizontal array. Therefore, we should balance the purity and price of the color to determine the composition methods of the three primary colors, in three-color design applications we usually achieve the white balance and maximum expected brightness value by adjusting and setting the LED current.

 
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