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Home > Church Lighting Knowledge > Power type LED lights on in the application
Power type LED lights on in the application

LED lamps for lighting efficiency in the field of
Lighting efficiency (light output coefficient)
In daily life, people mostly used in nearly all the radiation source. All to make light of shooting without radiation exposure to the region, resulting in waste of energy or light pollution. Therefore, in order to send the light source can be used as much as possible but does not produce glare and light pollution, protection of safe and reliable light source to work, you must use the lamps on the light source to limit the radiation area, in the case of the same optical power increase by as much as possible according to the region irradiance. Will involve using the same lamp efficiency.
In order to measure the level of energy efficiency lighting use, people with light output of light energy and light within the light output of light energy measured by the ratio between its efficiency, called the lighting efficiency (also called light output coefficient). It is used to measure the energy efficiency of lighting important indicator. As the use of different lamps, designed in the form of large differences also exist. The efficiency of different forms of lighting there are significant differences among large, generally 50 to 80%. Efficient lamps whose light output coefficient above 80%, light can be more fully utilized. Low efficiency lamps and even light output coefficient less than 25%, most of the light energy into heat and then wasted. Lighting and lighting engineering design, select Guang high coefficient of light output, to ensure safety and Bu in the glare of circumstances can produce play 节约 energy role; selection of lamps, such as inefficient or a considerable portion of light shooting at the sky, will result in unnecessary waste.
Electric lamp, high brightness point of light output coefficient
High brightness point light source such as high pressure sodium, metal halide, the luminous efficiency can reach 60 ~ 90 lm / W or more, but because they are too concentrated and the light output as all the radiation sources in use, such as right to shelter , will have a strong glare. Therefore, these light sources in the application process must be according to their lights to increase illumination area and reduce light loss and prevent glare. Most of these light sources produce light energy in the light of a reflection or secondary reflection, there will be some attenuation of its energy. When used for lighting lamps and floodlights efficient, less efficient when used in courtyard. After lighting the light source into the actual luminous efficiency of about 30 ~ 70 lm / W or so.
Energy-saving lamps in a number of lamps in the light output coefficient
Now have more extensive use of energy-saving lamps, the shape is tubular, light efficiency is typically 60 lm / W. Energy-saving lamps for indoor and outdoor general lighting some lawn, its light can be to maximize; but for the courtyard and down light, the light of the actual utilization of the lower.
Currently using the more common white bulb garden light, is a lighting and decoration as one of the lamps. Because of its light energy similar to all the radiation, so the actual shooting at the ground level of the light output of light energy lamps only 50%. This floor lamp fired a total luminous flux can be calculated as follows:
Фg = Фl × δ × 50% type in: Фg is fired at the ground, the total lamp luminous flux; Фl is the total light flux; δ is a white bulb light transmittance, usually 0.7; 50% of the coefficient is due from issued light lamps all fired only half the ground.
If the white ball used in a lamp bulb 30W energy saving lamp, the total luminous flux of 30W × 60lm / W = 1800lm; then fired at the ground, the total flux is:
Фg = 1800 × 0.7 × 50% = 630 lm
It can be seen that the theoretical light bulb light utilization efficiency is only 35%. In practice, due to bulb appearance will be dust pollution will be insects inside are often contaminated, so the actual value of δ less than 0.7.
Lamp is more common to use an indoor lighting. Its low installation height. For security purposes and to prevent glare and to consider the aesthetic needs of most embedded in the lamp light barrel. When the energy-saving lamps for the lamp, most of light and subject to double or multiple reflections before being shot; this process there will be greater in light attenuation. Vertical Downlight light efficiency is lower than horizontal lamp. Therefore, when installation of energy-saving lamps for use in vertical lamp, the lamp efficiency and sometimes less than 25% of its energy saving effect is not obvious.
LED lamps light output coefficient
For the power type LED, the light radiation direction are one-way. LED in the package, if installed in a different light refraction angle of the exit lens, injection of the beam of radiation on different angles. Designer lighting according to the characteristics of various types, selecting different radiation angle of LED.
When the LED for street lamp, the choice of a group of 1400's big launch angle angle LED. Installation of LED light axis can be tilted out of 300 ~ 450, which can be according to the region becomes more uniform illumination. LED light emitted without any shade for reflection, there is no need to use any mask to be decorated. Most of its light are fired directly from the source ground. As the height of 3.5m above street lamps, and the optical power per unit area is lower than the incandescent lamp, so not enough to create glare, do not use any mask to block. Therefore, LED lamps light up to 95% efficiency. As mentioned above, white light bulb with a 30W energy saving lamps fired at the ground, the total luminous flux of 630 lm, while the use of 45 lm / W when the LED just 14W, no jacket, the energy saving effect is quite significant.
When the LED for the lamp, the choice of radiation angle of a group of 600 small-angle LED, LED light installation axis perpendicular to the ground. This design allows most of the light energy can be directly at the irradiated area, only a small amount of light reflected through a post-injection. Therefore, when the LED lamp for the lamp efficiency of 90%.
In addition to the above two lamps outside, LED lighting in various areas of application, as long as the designer to the performance of the power type LED has a full understanding, we can design a high light output coefficients of various types of lamps.
LED lighting field advantage for the
LED lighting field for some special advantages. First of all, LED light efficiency reached 47 lm / W, close to the typical value of energy-saving lamps. This year there will be 95 lm / W of power type LED market; it came, would the most efficient LED light source to become one. Therefore, the use of LED lighting to replace incandescent and fluorescent lamps, etc. are no longer any major technical obstacles, just a matter of time. Secondly, the power type LED features a one-way radiation. He sent most of the light reflection can be reached directly without going through the irradiated object, so that maximum light can be issued, substantially improved the efficiency of the lamp. Third, because the long life of LED, green. Purchasing power currently available to the average type LED time between failures and more than in 40000h; if the work day, 11h, available years. Almost all of its waste recycling. This not only saves energy but also save resources and protect the environment. After the other light waste causes environmental pollution, especially after the abandonment fluorescent lamp mercury within the interests of the environment and the water will cause serious pollution. Fourth, the LED light source can be no flash, no ultraviolet radiation is very low, without any harm to the eyes. The LED for indoor lighting or take a long time for people to work and study places the lighting can play a role in real eye. Fifth, aesthetic needs. LED, with its characteristic shape, in lighting design to give designers a rich imagination. It can be a colorful night lighting and set decoration in one, so the city more beautiful, more brilliant the urban night.
With the excellent characteristics of LED, with the country's determination to build economical society, with "Long-term Scientific and Technological Development Plan" (2006-2020), the added energy efficient, long life lighting products include semiconductor priority theme, I believe a number of years, LED lighting in the field will be widely used.
LED lamps use investment earnings compared
In the living area and urban sub-trunk road lighting project, cables, transformers and lighting costs cabinet occupies a significant part of total project investment. If used in the engineering design phase LED lamps, you can not only save a lot of cable costs, but also to save power transformer capacity and appropriate lighting to save power distribution cabinet. Therefore, the total investment, the use of LED lights when there is no significant increase in total investment. LED lights replaced with the original plot and road lighting, although the lighting of the investment costs increased, but because of its low power consumption, long life of more than 40000h, basically the maintenance-free, so its operating costs and other light sources seems quite low compared to. To introduce the white front light bulb for example, were loaded onto the ball inside the bubble energy-saving lamps 30W or 100W incandescent. They fired at the ground luminous flux of LED lights with 14W considerable.

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