Energy Saving Features
LED light source with high luminance efficiency
Comparison of luminous efficiency: incandescent light efficiency is 10-15lm, tungsten halogen light efficiency is 12-24 lumens/watt, fluorescent light 50-90 lumens/watt, sodium light 90-140 lumen/watt, most of the power consumption becomes heat loss.
LED light efficiency: It can emit 50-200 lumens/watt, and its light emission has good monochromaticity and narrow spectrum. It can directly emit colored visible light without filtering.
2.LED light source consumes less power
Single LED tube power ranges from 0.03-0.06 Watts when driven by DC. The single tube voltage is between 1.5-3.5 Volts. The current 15-18 mA is a high-frequency device that has a quick response time and enables it to be operated with varying frequencies. When used with the same lighting effect, the power consumption is one ten thousandth of that of incandescent lamps and one half of that of fluorescent tubes. In Japan, it’s estimated that LEDs are twice as energy-efficient as fluorescent bulbs, and can replace up to half of the incandescent lamps in Japan. This would save 6 billion liters crude oil each year. The power of a fluorescent lamp that has the same effect as an LED is 18 watts. .
3.LED light source has long service life
Electronic light field radiation is used to produce light in fluorescent lamps, tungsten halogen bulbs, and incandescent lamps. The filament is susceptible to heat deposition and light loss. It emits light. LED lamps are small, lightweight, and encapsulated with epoxy resin. They can withstand high strength mechanical impact.
4.Strong safety and reliability
It is safe to touch and has a low calorific value. It can control the angle and pattern of light with accuracy.
5.LED light source is beneficial to environmental protection
LED is an all-solid-state light emitter, is impact-resistant and not easily broken, is recyclable, has no pollution, reduces the generation of harmful gases such as sulfur dioxide and nitrides, and greenhouse gases such as carbon dioxide, and improves people’s living environment. This is a “green light source.”
There are currently three technologies for producing white LEDs: one, which uses the principle of three primary colors and the three ultra-high brightness LEDs of red, green, and blue that can be produced to mix the light intensity in a ratio of 3:1:6 to produce white; the other, which uses ultra-high-brightness LEDs Highly InGan blue LED, with a small amount of yttrium-diamond-granite-based phosphor added to the tube, it can produce yellow-green light under blue light excitation, and this yellow-green light can be combined with the transmitted blue light to synthesize white light. All three are incompatible to ultraviolet light. Light LED uses ultraviolet light to excite three primary color phosphors or other phosphors to produce white light mixed with multiple colors.
6.LED light source is more energy-saving
Of course, energy saving is the main reason why we consider using LEDs. LEDs are more expensive than conventional light sources. However, using the energy savings to pay back the investment will result in a net return of up to several times that amount in four to nine years.
life of lights
Constant current source driving is the best way to drive LEDs. Using constant current source driving, there is no need to connect a current limiting resistor in series with the output circuit. The current flowing through the LED is not affected by external power supply voltage changes, ambient temperature changes, and the discreteness of LED parameters. The LED current is kept constant, allowing the many excellent features of the LED to be fully utilized.
An LED constant current power supply is used to power LED lamps. The LED current is detected and controlled automatically during the operation of the power source, so there is no worry about an excessive current flow through the lamp at the time of powering on or a short circuit. Bad power supply.
Lamp housing
LED lights have the characteristics of high efficiency, environmental protection and long life. However, people who often use LED lights will find that because LEDs are extremely bright, they can easily turn light energy into heat energy, making LED lights very hot. If the LED is unable to dissipate its heat as quickly and efficiently as possible, it will have a shorter lifespan.
Many LED manufacturers use aluminum casings for LED lamps. Aluminum casings have a beautiful look, are lightweight and easy to dissipate the heat. Aluminum casings are used in many high-end electronics. For example, the company’s high-end notebook computer series “Mac Pro” uses an all-aluminum casing to facilitate notebook computer heat dissipation, so that the computer does not even need a fan.
Aluminum shells can extend the life of the LED wick, and also make it look more beautiful. The aluminum lamp cup, however, is expensive and has a high production cost. The lamp cup must be turned on a lathe. Some LED lights of high and medium quality will have aluminum housings.
Plastic housings are another common housing for LED lamps. Since the cost of plastic shells is very low, some low-end LED lamps will use plastic shells. However, plastic shells are not easy to dissipate heat, and plastics tend to melt and sublimate when heated to produce harmful gases. Therefore, Europe, North America, and Japan do not use plastic casings. Due to the large-scale demand for cheap LED lights in some areas of the country, plastic casings have a large sales volume in the country.
Household lamp
LEDs can be used to replace spiral light bulbs or energy-saving lights, with wattages ranging from 5-40 Watts. As of 2010, some lamps can even replace higher-power light bulbs. For example, a 13-watt light bulb has about the same brightness as a 100-watt incandescent lamp. (General incandescent lamps have an efficiency standard of about 14 to 17 lumens/watt, depending on their size and voltage. EU standards require that an “energy-saving lamp” equal to a 60 watt incandescent bulb must have at least 806 lumens.
Most LED bulbs are designed to be non-dimmable, but some can be operated with dimmers and have a narrow illumination angle. Since 2010, the price of these light bulbs has dropped from $30 to $50. LED bulbs are more energy efficient than energy-saving light bulbs, and can last up to 30,000 hrs if the heat is properly dissipated. Energy-saving bulbs have a life expectancy of about 8,000 to 9,000 hours. Incandescent light bulbs have a lifetime of around 1,000 hours. LED bulbs are able to be used for up to 25 years and their brightness does not decrease over time. Energy Star standards stipulate that after a lightbulb has been used for 6,000 hrs, its brightness should decrease by 10% and in the worst case, not more than 15%. Unlike fluorescent lamps, LED bulbs are mercury-free. LED bulbs are available in a variety of colors. The higher price of LED bulbs is offset by the lower cost of electricity and maintenance.
Special Purpose
White LED bulbs are highly efficient and have a leading position in low-power consumption markets (such as flashlights, solar garden lights, pedestrian street lights, bicycle lights, etc.). Single-color LED lights are often used to make traffic lights and holiday lighting.
LED lights were a popular topic in 2010 for horticulture, agriculture and other related circles. NASA was the first to use LED lights in space for indoor gardening. These special planting lights are specially designed so that the light waves are exactly the wavelengths absorbed by chlorophyll. This not only promotes growth, but also reduces light waves that are not absorbed by plants, causing waste. These lights were designed to take into account both red and blue, as only these two colors are required for photosynthesis in the visible spectrum. These LED lights are more suitable for indoor growing than similar products because they can produce the same brightness, don’t require a ballast and produce less heat. A reduction in heat can help reduce evapotranspiration and thereby the number of fillings. Plants should not be watered too much when using these lights.
Buying guide
- Choose LEDs with the “Three Guarantees”, and lamps that have the CCC certification mark.
- It depends on whether the LED lamp product labels are complete. Regular products should be labeled;
- The CCC mark is a safety certification that you can look for on the LED power cord.
- Check whether the live parts of the lamp are exposed. The metal lamp holder should not be touched by fingers after the light source has been installed.
- Check whether the LED chip is in accurate position and whether the lens or screen is worn.
Cause of damage
- The voltage is unstable. An increase in the power supply voltage is particularly likely to cause damage to the LED lamp. A sudden voltage increase can be caused by a number of factors, including faulty power supplies or incorrect usage. Power supply voltage can suddenly increase. high.
- The power supply path of the lamp is partially short-circuited. This is usually caused by a component in the circuit or a short-circuit in other wires that increases the voltage in this place.
- The LED may be damaged by its own quality, causing a short-circuit. This voltage drop then spreads to the other LEDs.
- The lamp’s heat dissipation is bad. The lamp’s lighting is actually a process of heat dissipation. The characteristics of LEDs will easily degrade if the temperature in the lamp is high. The LED lights can be damaged by this.
- Water is conductive and will cause the lamp to short-circuit.
- Failure to do anti-static work during assembly has resulted in the interior of the LED being damaged by static electricity. It is easy to damage the LED even if voltage and current are normal.
The common causes of LED flickering and their solutions
Normally, the human eye can detect light flickers with a frequency of up to 70 Hz, but not with frequencies higher than this. Therefore, in LED lighting applications, if the pulse signal has a low-frequency component with a frequency lower than 70 Hz, the human eye will feel flicker. Of course, in specific applications, there are many factors that may cause LED lights to flicker.
In offline LED lighting applications with low power, an isolated flyback is a common topology.
The flyback regulator’s sinusoidal square-wave power conversion does not supply constant energy to primary bias. This can cause the dynamic self-power (DSS)) circuit to activate, causing the light to flicker.
In order to avoid this problem, it is necessary that the bias circuit be partially discharged at each half-cycle. Correspondingly, the values of the capacitors and resistors that make up the bias circuit need to be chosen appropriately.
Even LED drivers with excellent power factor correction that support TRIAC dimming require electromagnetic interference (EMI).
The transient current caused by the TRIAC step will excite the natural resonance of the inductor and capacitor in the EMI filter.
If this resonant characteristic causes the input current to drop below the TRIAC holding current, the TRIAC will shut down. After a short delay, the TRIAC usually turns on again, stimulating the same resonance.
This series of events may repeat multiple times during one half cycle of the input power waveform, resulting in visible LED flashes. In order to solve this problem, a requirement for TRIAC dimming would be that the input capacitance is very low. This capacitance must also be decoupled from the winding impedance by the TRIAC.
According to the formula, if the capacitance in the dimming module is reduced, the resistance of the resonant circuit can be increased, which in principle suppresses oscillation and restores the desired circuit operation.