The Six Key Characteristics of LED Lights
The Six Key Characteristics of LED Lights

Energy saving features

1.LED light source has high luminous 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 emits 50-200 lumens/watt and has a narrow spectrum and good monochromaticity. It can emit visible colored light directly without any 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. .

LED light source is long-lasting.

Electronic light field radiation is used to produce light in fluorescent lamps, tungsten halogen bulbs, and incandescent lamps. The filament emits light and is prone to burning, heat deposition, and light attenuation. LED lamps are small, lightweight, and encapsulated with epoxy resin. They can withstand high strength mechanical impact.

Safety and reliability are high.

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

LEDs are solid-state lights that emit light. They are impact-resistant, recyclable, have no pollution and reduce the production of harmful gases like sulfur dioxide and nitrides. 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. The three types are incompatible with ultraviolet light. Light LEDs use ultraviolet light to excite phosphors of three primary colors or other phosphors in order to produce a white light with multiple colors.

LED light source is energy-saving

Energy savings is the primary reason we are considering LEDs. LEDs may be more expensive than traditional light sources, but using energy savings in one year to recoup the investment in light sources will lead to a net payback period of several times the annual energy savings in 4 to 9 years.

life of lights

The best way to drive leds is with constant current sources. When using constant current source drive, it is not necessary to connect a resistor that limits the current in series with output circuit. The LED current is not affected externally by changes in voltage, temperature, or LED parameters. influence, so that the current can be kept constant and the various excellent characteristics of LED can be fully utilized.

LED lamps are powered by a constant-current LED power supply. 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.

LED manufacturers often use aluminum cases for LED lamps. Aluminum casings are easy to dissipate heat, have beautiful appearance and are lightweight. Many high-end electronic products use aluminum casings. The company's "Mac Pro" high-end notebook computers use an aluminum casing for heat dissipation. This means that the computer doesn't 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. Therefore, some high-quality and medium-quality LED lights will use aluminum lamp housings.

Plastic housings are another common housing for LED lamps. Some low-end LED lights use plastic shells because they are inexpensive. Plastic shells do not dissipate heat well, and they tend to melt or sublimate when heated, producing harmful gases. Therefore, Europe, North America, and Japan do not use plastic casings. Plastic casings are popular in certain areas of the country due to the high demand for LED lights.

Household lamp

Many LED lights can replace spiral incandescent lamps or energy-saving light bulbs, ranging from 5-40 watts, low-power incandescent lamps, to 60 watts (requiring only about 7 watts of electricity). As of 2010, some lamps can even replace higher-power light bulbs. A 13-watt bulb, for example, has the same brightness of a 100-watt lamp. Incandescent bulbs have an efficiency of 14-17 lumens/watt depending on the size and voltage. According to EU standards, an "energy-saving light bulb" equivalent to a 60-watt incandescent lamp requires at least Can output 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. Incandescent lamps generally only have a lifespan of 1,000 hours, and energy-saving light bulbs only have a lifespan of about 8,000 hours. Therefore, LED bulbs can be used for about 25 to 30 years, and the brightness decreases very little 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%. LED bulbs do not contain mercury, unlike fluorescent lamps. LED bulbs also come in different color options. The higher price of LED bulbs is offset by the lower cost of electricity and maintenance.

Special Purpose

White LED bulbs have high efficiency and are a leader in the low-power consumption market (such as flashlights or solar garden lights for pedestrian street lighting, bicycle lights etc.). Single-color LED lights are often used to make traffic lights and holiday lighting.

In 2010, LED lights became a hot topic in the horticulture and agricultural circles. NASA pioneered the use of LED lights for planting in space, and domestic and commercial indoor gardening followed suit. These planting lights have been designed to emit light waves that are identical to the wavelengths of chlorophyll. It not only encourages growth but also reduces the light waves which are not absorbed and cause 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. Compared with similar products, these LED lights can provide the same luminosity, do not require a ballast, and generate much less heat than gas discharge lamps, making them very suitable for indoor cultivation. Less heat can reduce evapotranspiration, thereby reducing the number of fillings. Plants should not be watered too much when using these lights.

Guide to buying

  1. Choose LED lights with the "Three Guarantees" commitment and choose lamps with the CCC certification mark;
  2. The LED lamp productlabels must be complete. Labels should be placed on all products.
  3. Check whether the LED light power cord has the CCC safety certification mark;
  4. The live metal parts of the lamp should not be touched. The metal lamp holder should not be touched by fingers after the light source has been installed.
  5. Check whether the LED chip is in accurate position and whether the lens or screen is worn.

Damage caused

  1. The voltage is unstable. An increase in the power supply voltage is particularly likely to cause damage to the LED lamp. There are many reasons for a sudden increase in voltage, such as quality problems with the power supply or improper use by the user. The power supply voltage may suddenly increase. high.
  2. 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.
  3. The LED may be damaged by its own quality, causing a short-circuit. This voltage drop then spreads to the other LEDs.
  4. The heat dissipation effect of the lamp is not good. The lamp's lighting is actually a process of heat dissipation. If the temperature inside the lamp is too high, the characteristics of the LED will easily deteriorate. The LED lights can be damaged by this.
  5. It is also possible that water has entered the lamp, because water is conductive, which will short-circuit the circuit of the lamp.
  6. Static electricity has damaged the LED's interior due to a failure to perform anti-static work. Even if normal voltage and current values are applied, it is very easy to cause damage to the LED.

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. In LED lighting applications, If the pulse signal contains a low frequency component, with a lower frequency than 70 Hz the human eye can 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. The values of the resistors and capacitors in the bias circuit must be selected accordingly.

Additionally, electromagnetic interference (EMI) filters are required even in applications using LED drivers that provide excellent power factor correction and support TRIAC dimming.

The TRIAC step causes a transient current that will cause the inductor to resonate and the capacitor to resonant 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 brief delay, the TRIAC will usually turn on again and stimulate the same resonance.

The LEDs will flash if this sequence of events occurs multiple times in a half-cycle of the input waveform. 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.