1. High luminous efficiency of LED light source
Comparison of luminous efficiency: incandescent lamp luminous efficiency at 10-15lm, halogen tungsten lamp efficiency for 12-24 lumens/watt, fluorescent lamp 50-90 lumens/watt, sodium lamp 90-140 lumens/watt, most of the power consumption into heat loss.
LED light efficiency: can be sent to 50-200 lumens/watt, and the monochromatism of the light is good, narrow spectrum, no filter, can directly send out colored visible light.
2.LED light source consumes less power
LED single tube power 0.03-0.06w, dc drive, single tube drive voltage 1.5-3.5v. 15-18 ma reflect current speed, can be in high frequency operation, in under the condition of same illumination, power consumption is one over ten thousand of the incandescent lamp, fluorescent tubes, half of the Japanese estimates that if use 2 times higher than fluorescent lighting LED to replace half of Japan's incandescent lamp and fluorescent lamp, can save the equivalent of 6 billion litres of crude oil a year, the same effect of a more than 40 w fluorescent lamp, and use the power of each LED only 18 watts.
3. Long service life of LED light source
Incandescent lamp, fluorescent lamp, halogen tungsten lamp is to use electronic field radiation emitting light, filament light easy to burn, thermal deposition, light attenuation characteristics, and USES the LED lamp is small volume, light weight, epoxy resin encapsulation, can withstand the high strength mechanical shock and vibration, invulnerability to breakage and the average life expectancy of 3-50000 hours, the service life of the LED lamps and lanterns of up to 3-5 years, can significantly reduce the maintenance cost of lamps and lanterns to avoid frequently changing light.
4. Strong safety and reliability
Low calorific value, no heat radiation, cold light source, safe touch, precise control of light type and Angle, color and light, no glare, free of mercury, sodium and other potentially harmful substances.
5.LED light source is conducive to environmental protection
LED for all solid luminous body, impact resistance is not easy to break, waste can be recycled, no pollution to reduce a lot of sulfur dioxide and nitrogen compounds and other harmful gases and greenhouse gas production to improve people's living environment, can be called "green lighting light source.
Production of white LED technology at present, there are three types: a, by using the theory of three primary colors and have been able to produce red, green, blue three kinds of high brightness LED 3:1:6 mixing ratio of the light into a white, two, using the ultra high InGan blue leds, the tube always add a little yttrium drill pomegranate as the main body of the phosphor powder, it can be in blue light that inspired the yellow green, and the yellow green and white light blue synthesis and passes, three is an ultraviolet LED, using ultraviolet excitation tricolor phosphors or other phosphors, multicolor mixture of white light.
6.LED light source is more energy saving
Of course, energy saving is the most important reason for us to consider using LED. Maybe LED is more expensive than traditional light source, but the investment of light source can be recouped with the energy saving for one year, so as to obtain several times of the net period of energy saving in 4-9 years.
Constant current source drive is the best LED drive, using constant current source drive, no need in the output circuit series current limiting resistance, the current flow through the LED is not affected by the external power supply voltage change, environmental temperature change, as well as the discrete LED parameters, so as to maintain a constant current, full play to the various excellent characteristics of LED.
The LED constant current power supply is adopted to power the LED lamps. Since the current flowing through the LED will be automatically detected and controlled during the power supply operation, there is no need to worry about the excessive current flowing through the LED when the power is on, or the short circuit of the load will burn out the power supply.
LED lights have the characteristics of high efficiency, environmental protection and long life. However, people who often use LED lights will find that because of the extraordinary brightness of LED light, it is easy to turn light energy into heat energy, which makes LED lights very hot. At this point, if the LED and so on can not dissipate heat as soon as possible, its life will be greatly reduced.
Many LED manufacturers use aluminum enclosures for LED lamps. Aluminum housing is easy to heat, beautiful appearance, lightweight, many high-end electronic products are made of aluminum housing. For example, the company's high-end line of laptops, called Mac Pro, have an all-aluminum casing that allows them to dissipate heat without having to install a fan.
LED with aluminum shell can increase the life of the wick, so that LED lights look beautiful. However, the cost of aluminum lamp cup is relatively expensive, the production cost is very high, the lamp cup needs to be processed with a lathe. Therefore, some high quality, medium quality LED lamp will use aluminum lamp shell.
Another common LED lamp housing is the plastic housing. Due to the low cost of plastic shell, some low-end LED lamps will use plastic shell. But plastic shell is not easy to heat, plastic heat is also easy to melt, sublimation of harmful gases. So, Europe, North America, Japan do not use plastic shell. Plastic cases are selling well in China, where demand for cheap LED lights is high in some parts of the country.
Many LED lights can replace the spiral incandescent or energy-saving bulbs, from 5-40 watts, low power incandescent, to 60 watts (only about 7 watts of power). By 2010, some could replace even more powerful bulbs, such as a 13-watt bulb that matches the luminosity of a 100-watt hot blaze. (the standard for the visual efficiency of a general incandescent light is about 14 to 17 lumens per watt, depending on its size and voltage. According to European Union standards, an "energy efficient bulb" equivalent to a 60-watt hot blaze must have a minimum output of 806 lumens.
Most LED bulbs are designed to be non-dimmable, but some work with dimmers and have narrow lighting angles. Starting in 2010, these bulbs started to drop in price from $30 to $50. LED bulbs are more energy efficient than light bulbs and, when properly cooled, last up to 30,000 hours. Hot blazing lamp has 1000 hours of life only commonly, save electric bulb to also have about 8000 hours only. As a result, LED bulbs last about 25 to 30 years, and their luminosity declines little over time. The energy star standard stipulates that after 6000 hours of use, the luminosity attenuation should be within 10%, and the worst can not exceed 15%. Unlike fluorescent lights, LED bulbs are mercury-free. LED bulbs are also available in different colors. The higher price is offset by lower electricity and maintenance costs.
White LED bulbs are highly efficient and have a leading position in low-power markets such as flashlights, solar garden lights and pedestrian and bicycle lights. Monochrome LED lights are commonly used for traffic lights and holiday lighting.
LED lighting became a hot topic in horticulture and agriculture in 2010. NASA pioneered LED lighting in space, followed by home and commercial indoor gardening. These special lamps are specially designed for planting. The light wave is just the wavelength of chlorophyll absorption, which promotes the growth and reduces the light wave that plants do not absorb, resulting in waste. In the visible spectrum, photosynthesis requires only red and blue, so these lights are designed in both colors. These leds offer the same luminosity as their counterparts, require no ballast and generate far less heat than gas discharge lamps, making them ideal for indoor gardening. Less heat can reduce evapotranspiration, thus reducing the number of irrigation. For this reason, plants should not be over-watered when using these lights.
1. Choose LED lamps with "three guarantees" commitment and lamps with CCC mark;
2, to see whether the LED lamp product identification is complete, regular products should be identified;
3. Check whether the power cord of LED lamp has CCC mark;
4, to see whether the lamp charged body is exposed, the light source into the lamp holder, the finger should not touch the live metal lamp;
5. Check whether the LED chip is in accurate orientation and whether the lens or screen is worn.
1. The current voltage is not stable, and the increase of power supply voltage is particularly likely to cause the destruction of LED lights. There are many reasons for the sudden rise of voltage, such as the quality of power supply, or improper use of users.
2. The power supply path of the lamp tube is partially short-circuited, which is usually caused by the short-circuit of some part of the line or other wires, which increases the voltage at this place.
3. It is also possible that the LED is damaged due to its own quality and thus forms a short circuit, and its original voltage drop is transferred to other leds.
4. The heat dissipation effect of lamps is not good. As we all know, the luminaire luminescence is a process of heat dissipation. This is also easy to damage LED lights.
5. There may be water in the lamp, because the water is conductive, which will make the lamp short circuit.
6. When assembling, the anti-static work is not done properly, so that the LED's interior has been damaged by static electricity. Although the normal voltage and current value are applied, it is extremely easy to cause LED damage.
The common cause and treatment of LED lamp flicker
The human eye can usually perceive light flashes at a frequency of up to 70 Hz, but not above this frequency. Therefore, in LED lighting applications, if the pulse signal frequency is lower than the low frequency component of 70 Hz, the human eye will feel the flicker. Of course, in specific applications, there are a number of factors that can cause LED lights to blink. For example, a common power topology in off-line low-power LED lighting applications is the isolated flyback topology. With 8W off-line LED driver complying with "energy star" solid-state lighting standard; As an example of a reference design, since the sinusoidal square wave power conversion of a flyback stabilizer does not provide a constant energy to the primary bias, a dynamic self-supply (DSS) circuit may be activated and cause flicker. In order to avoid this problem, the primary bias must be able to discharge at each half-cycle part, and accordingly, the values of capacitance and resistance that make up the bias circuit need to be selected appropriately.
In addition, electromagnetic interference (EMI) filters are required even in LED driven applications that provide excellent power factor correction and support for TRIAC dimming. The transient current caused by the TRIAC step excites the natural resonance of the inductor and capacitor in the EMI filter. If this resonance characteristic causes the input current to drop below the TRIAC maintenance current, TRIAC will shut down. After a short delay, the TRIAC usually conducts again, triggering the same resonance. Within a half-cycle of the input power waveform, this series of events may be repeated many times, resulting in visible LED flashes. To address this, a key requirement of TRIAC dimming is that an EMI filter has a very low input capacitance that can be decoupled through TRIAC and winding impedance. According to the formula, if the capacitance in the dimming module decreases, the resistance of the resonant circuit can be increased. In principle, the oscillation can be suppressed and the desired circuit can be restored.