2.2 Light sources used in. LED fluorescent lamp has straw hat head and patch lamp bead.
Among them, the commonly used patch lamp beads are 3528, 5050, 1W, etc. 1) transparent PC shell, high light transmission performance, you can see the lamp beads inside;
2) translucent frosted shell with soft light.
4.LED fluorescent lamp has built-in power supply, and its working voltage range is wide, from 85V to 265V.
5.LED fluorescent lamps can be made into red, yellow, blue, green, white and warm white. LED fluorescent lamp has the characteristics of high quality, durability and energy saving, and has a wide range of projection angle adjustment. 18W brightness is equivalent to ordinary 40W fluorescent lamp, which is resistant to high temperature, moisture, water and leakage. The working voltage is 1 10V and 220V, and the cover can be glass or PC. Lamp holders are the same as ordinary fluorescent lamps.
LED fluorescent lamp adopts the latest LED light source technology and digital appearance design, which can save electricity by more than 70%. The light intensity of 12W LED fluorescent lamp is equivalent to that of 40W fluorescent lamp, and the life of LED fluorescent lamp is more than 10 times that of ordinary fluorescent lamp. It is almost maintenance-free, and there is no need to change lamps, ballasts and upconverters frequently. Environment-friendly semiconductor electric light source has soft light and pure spectrum, which is beneficial to users' vision protection and health. The cold light source of 6000K gives people a cool feeling visually, and the humanized illumination difference design is more helpful to concentrate and improve efficiency.
1. has strong applicability, which improves the adaptability and reliability in various indoor and outdoor harsh environments.
2. Rich color: It is composed of three primary color (red, green and blue) display unit boxes, which enables the electronic screen to display dynamic images with rich colors, high saturation, high resolution and high display frequency.
3. High brightness: With ultra-high brightness LED, it can still be clearly seen from a distance under strong sunlight.
4. Good effect: With nonlinear correction technology, the image is clearer and the layering is stronger.
5. Strong reliability: adopting static scanning technology and modular design technology, the reliability and stability are higher.
6. Diversification of display modes: support multiple display modes.
disadvantaged
The price is expensive, and there is still a big gap between the general achievable light efficiency and the theoretical light efficiency, and there is still a big gap between the achievable life and the theoretical life. There is still a certain calorific value, and the light attenuation can be greatly reduced.
superiority
1, environmental protection lamps, protect the earth.
2, efficient conversion, reduce fever
3, quiet and comfortable, no noise
4. Soft light protects your eyes.
5, no ultraviolet rays, no mosquitoes
6. The voltage can be adjusted between 80 volts and 245 volts.
7. Save energy and prolong life.
8, solid and reliable, long-term use.
9. Compared with ordinary fluorescent lamps, LED fluorescent lamps do not need ballasts, upconverters and strobes.
10 is maintenance-free, and frequent switching will not cause any damage.
1 1. Safe and stable quality can withstand 4kv high voltage and low heat dissipation, and can work at low temperature of -30℃ and high temperature of 55℃.
12. Good earthquake resistance and convenient transportation.
13. Energy-saving, long service life, good applicability, short response time, environmental protection, no harmful metals, easy recycling of waste, bright colors, pure luminous colors, narrow spectral range, and can be mixed into color or white light by three primary colors of red, green and blue. Generally called the external quantum efficiency of the element, it is the product of the internal quantum efficiency of the element and the extraction efficiency of the element. The so-called internal quantum efficiency of the module is actually the photoelectric conversion efficiency of the module itself, which is mainly related to the characteristics of the module itself (such as the energy band, defects and impurities of the module material), the barrier crystal composition and structure of the module. The extraction efficiency of a module refers to the number of photons actually measured outside the module after the photons generated inside the module are absorbed, refracted and reflected by the module itself. Therefore, the factors about extraction efficiency include the absorption of the component material itself, the geometric structure of the component, the refractive index difference between the component and the packaging material, and the scattering characteristics of the component structure. The product of internal quantum efficiency and extraction efficiency of the module is the luminous effect of the whole module, that is, the external quantum efficiency of the module. The early development of this module focused on improving its internal quantum efficiency. The main method is to improve the quality of the barrier crystal, change the structure of the barrier crystal, so that electric energy is not easily converted into heat energy, and then indirectly improve the luminous efficiency of LED, so that the theoretical internal quantum efficiency of about 70% can be obtained, but this internal quantum efficiency is almost close to the theoretical limit. In this case, it is impossible to improve the total light quantity of the module only by improving the internal quantum efficiency of the module, so improving the extraction efficiency of the module has become an important research topic. The main methods are: changing the particle shape-tip structure and surface roughening technology.
Now, scientists at the University of Georgia have announced what is said to be the world's first warm white LED lamp using a single phosphor and a single light-emitting unit. The paper on the details of this kind of information is published in the latest issue of Optical Science and Application of Nature Publishing Group.
Pan Schmidt, the main author of the paper and an associate professor at the University of Georgia, said: "At present, white LED lights are mainly used in flashlights and car headlights, but their light blue cold light is not very popular, especially in the field of indoor lighting. Our data has reached the warm color temperature, and together we can complete realistic color reproduction. In the past, LED lamps improved with a single phosphor could not achieve this effect. "
Pan Zhengwei indicated that there are two main targets to measure the quality of artificial light. The correlated color temperature is used to measure the temperature of light. For indoor lighting, the color temperature below 4000K (Kelvin temperature) is ideal, while the associated color temperature above 5000K, the light-emitting device will emit light blue cold light like a white LED lamp. Another important goal is color reproduction, that is, the ability of light source to imitate natural light. The reduction degree above 80 is an ideal choice for indoor lighting. Below this value, the color will appear distorted.
The data developed by Pan and his collaborators meet these two conditions, the correlated color temperature is controlled below 4000K, and the color recovery reaches 85.
Pan said that if the outer layer of the blue LED chip is coated with different colors of phosphors, it can emit warm white light, so that a white LED lamp based on phosphors can be made. However, it is laborious and expensive to match these raw materials according to the exact share, and the final light color will be different, because each raw material reacts differently to temperature changes.
Li, one of the authors of this paper and a doctoral student at the School of Engineering, University of Georgia, said: "Using a single phosphor can solve the problem of unstable light color, because a single data will not change with the increase of temperature."
In order to develop new phosphors, Pan Zhengwei and his team chose europium oxide, alumina, barium oxide and graphite powder, and mixed several of them together. Then, they put these powdery materials into a tube furnace and heated them to 1450 degrees Celsius. The vacuum condition in the furnace makes the vaporization data fall on the chassis, depositing yellow luminescent compounds, and then putting them into the light bulb.
Although the research results are very promising, Pan Kevin·Z stressed that there are still several problems to be solved before this kind of data can be used for lighting in homes, companies and campuses. The light efficiency of the new data is much lower than that of the current light blue white LED lamp. In addition, mass production will also face challenges. T5 :T8:
application area
With the deepening of environmental awareness, LED fluorescent lamps, LED floodlights and other LED lamps are widely used. Ruipu Lighting specializes in the production of LED fluorescent lamps, LED ceiling lamps, LED tubes and other LED lighting products.
(1) Incandescent lamps are almost always used to install energy-saving self-extinguishing switches on stairs, walkways or similar places in residential buildings, and LED fluorescent lamps are the most suitable replacement, with good energy-saving effect and remarkable economic benefits.
(2) It can also be used in shopping malls as spotlights of accent lighting, pavilions and public buildings.
(3) Safety ultra-low voltage maintenance lamp (SELV) is used for local lighting.
(4) There are many incandescent lamps and halogen lamps used in hotels, and LED fluorescent lamps are also suitable for such places, which can be used to replace incandescent lamps and halogen lamps: bedside lamps, reading lamps above the bed, night lamps, wardrobe lamps, bar lamps, door opening lamps, porch lamps and bathroom shower lamps that need dimming in the room can all be replaced by LED fluorescent lamps.
(5) Signs such as evacuation lighting and evacuation signs, as well as some standby lighting (when using HID lights in normal lighting), LED fluorescent lamps are more suitable.
(6) Use LED fluorescent lamps to replace spotlights such as MR 16 and MR25 (halogen lamps); These should require LED fluorescent lamps to have higher color rendering index (Ra) and warm color table (
(7) Auxiliary places of general buildings with low visual requirements, such as walkways, toilets, general warehouses, fans, water pump rooms, etc. , you can also use LED fluorescent lamp instead.
The concept of environmental protection and energy saving has been recognized by more and more people, which shows that the application scope of LED fluorescent lamp, LED electric light source and LED projection lamp will be wider and wider. 1, indoor lighting of large factories, production workshops, workstations and offices;
2. Indoor lighting of shopping malls and supermarkets;
3. The underground parking lot is used 24 hours a day, saving considerable electricity;
4, hospital indoor lighting;
5, school classroom lighting;
6. family.
Power?Supply?
The power supply of LED fluorescent lamp is the most important part of LED fluorescent lamp. If it is not selected properly, the LED fluorescent lamp can't exert its performance, or even can't be used normally.
constant current
The characteristics of LED semiconductor determine that it is greatly influenced by the environment. For example, if the temperature changes, the current and voltage of LED will increase, and the current of LED will also increase. Working beyond the rated current for a long time will greatly shorten the service life of LED. The constant current of LED is to keep its working current unchanged when environmental factors such as temperature and voltage change.
Power lamp board
Some customers design the lamp board first, and then look for the power supply, and find it difficult to have a suitable power supply, or the current is too large and the voltage is too small (for example, I & gt350 mA, V & LT40V); Either the current is too small, or the voltage is too high (such as me
operational current
Generally, the rated working current of LED is 20 mA, and some factories have used it up at the beginning and designed it as 20 mA. In fact, the working heat is very serious at this current. After many comparative tests, the design of 16- 18 mA is ideal. Total current of n parallel circuits =17 * n;
operating voltage
Generally, the recommended working voltage of LED is 3.0-3.6V After testing, most LEDs work at 3. 125V, so the formula of 3. 125V is more reasonable. The total voltage of M bulbs in series = 3.125 * m.