How to identify the quality of LED lighting fixtures

The quality of LED lamps mainly depends on several parameters:

1. Light attenuation, better LED lamps have a light attenuation of <30% before 25,000 hours; The main factors that determine the light decay are the quality of the light source and the difference in heat dissipation structure; The high-power light source packaged by the foreign original factory, such as the light attenuation of the cree light source is better than the light source of the domestic package, as a layman generally does not see the light source, the simple way of judgment is mainly **, the price of the light source of the foreign original packaging is much higher than that of the domestic packaging of the light source; Therefore, if you want to buy good quality LED lamps, you must provide the manufacturer information of the light source.

Spot ** high-power dc-dc DC converters, DC boosters, 36v 48v 60v electric vehicle inverters, electric vehicle intelligent DC converters. 24V-72V electric vehicle controller, etc.

2. Luminous efficiency, that is, the number of lumens per watt, unit lm w, he reflects the power-saving performance of the lamp, the better the lamp, the higher the luminous efficiency. At present, the light efficiency of LEDs is almost the same as that of compact fluorescent lamps, and with the improvement of LED light efficiency, Cree may mass produce a light source of 186LM W this year.

Spot ** high-power dc-dc DC converters, DC boosters, 36v 48v 60v electric vehicle inverters, electric vehicle intelligent DC converters. 24V-72V electric vehicle controller, etc.

3. The light source, whether it is a high-power LED or a straw hat lamp or a piranha-type LED; LED lighting fixtures use high-power LED as the light source, which is higher; Straw hat lamps or piranha-shaped LEDs** are very cheap and not suitable for lighting-grade lamps.

Spot ** high-power dc-dc DC converters, DC boosters, 36v 48v 60v electric vehicle inverters, electric vehicle intelligent DC converters. 24V-72V electric vehicle controller, etc.

4. The theoretical life of LED is 100,000 hours and the life of the general driving power supply is less than 100,000 hours; In order to ensure the life of the overall lamp, the driving power supply is also a key part; On the other hand, the LED must be a constant current drive, and if a low-cost constant voltage drive is used, the service life of the LED will be shortened. As an ordinary consumer, how to identify the quality of the LED driving power supply? Look at several parameters, light decay, service life, light efficiency, and warranty period.

The quality of LED lamps produced by manufacturers who dare to provide long-term warranty is better. Spot ** high-power dc-dc DC converters, DC boosters, 36v 48v 60v electric vehicle inverters, electric vehicle intelligent DC converters.

The main thing is to look at the appearance, followed by the brightness, and then to look at the after-sales service.

Look at the meticulousness of workmanship and the effect of light color.

Look at the lumens, look at the heat dissipation, look at the warranty, look at the appearance.

Simply determine whether the lamp head and lamp port are heated after two or three minutes, and feel whether the lamp head and lamp port are heated after the power is off. If it's hot, it's not LED.

See if it is power-saving, and the light is small and on.

1. Look at the overall "power factor of lamps": low power factor means that the driving power supply and circuit design used are not good, which will greatly reduce the service life of lamps and lanterns.

Second, look at the manufacturer's name and trademark, model, rated voltage, rated power is safe.

3. Look at the brightness of lamps and lanterns: Generally, the brightness of lamps with high power will be much brighter than those with small power, and at the same time, it will be much more expensive.

Fourth, look at the overall feeling of the lamp: the overall harmony, whether there are abnormal phenomena such as tilt, asymmetry, color difference, and different lines.

5. Check whether the lamps have 3C certification qualifications and review their contents.

6. Look at the antistatic ability of lamps: lamps with strong antistatic ability have long life and are durable.

7. Look at the internal structure of the lamp: the metal pipe entrance and exit through which the wire passes should have no sharp edge, and the measures can be chamfered or sheathed on the metal parts to avoid cutting the wire, causing the metal parts to be electrified and the risk of electric shock.

8. Look at the size of the lamp chip: The size of the chip is expressed by the side length, and the quality of the lamps and lanterns with large chips will be better than the quality of lamps with small chips.

9. Look at the lamps and lanterns: the lamps and lanterns with better quality are double tungsten wires, and the lamps and lanterns that are worse are generally single tungsten wires.

10. Look at the power efficiency of the lamp, the higher the power efficiency, the better, the higher, indicating that the power consumption of the power supply itself is smaller, and the output power is larger.

After reading so many introductions to the identification of lamps and lanterns, I believe you must have understood. In short, when buying lamps and lanterns, you should try to buy products that have passed the safety certification, and you must carefully identify and choose, once you are sloppy or careless, the lamps you buy back may bring you endless troubles and pain.

It is necessary to look at the quality of the chip and power supply.

1.Attention should be paid to the markings on the product:

1) See whether the manufacturer's name and trademark, model, rated voltage, rated power, etc. are safe;

2) Ceiling lamps, wall lamps, table lamps, floor lamps to be installed on the surface of wooden materials, and lamps marked with the F symbol.

2.Identification from protection against electric shock:

Attention should be paid to protection against electric shock. When the bulb is screwed in, after the lamp is energized, people will not be able to touch the live parts, and there will be no risk of electric shock.

If you buy incandescent lamps (such as chandeliers, wall lamps), install the bulb, and if there is no electricity, if you can't touch the lamp head on the bulb with your little finger, the anti-electric shock is basically compliant. If it is a fluorescent lamp (such as a recessed lamp, a fixed lamp), when installing the lamp and the starter, if the live parts cannot be touched with the little finger without power, the anti-electric shock performance is basically in line.

The non-compliance of the anti-electric shock of the lamp is generally caused by the use of anti-electric shock protection measures such as lamp holders that do not meet the requirements or live parts of the lamp without covers.

3.Identification of the cross-sectional area of the wire used in the lamp: the standard stipulates that the minimum cross-sectional area of the wire used on the lamp is squared, and some manufacturers in order to reduce costs, the cross-sectional area of the wire used in the product is only squared, in an abnormal state, such as the fluorescent circuit in the starting current can not jump, the whole line will work with the starting current, the starting current is larger than the normal working current, which will make the wire scorched, and the insulation layer will be burned out after the short circuit, resulting in danger.

The method of identification is: When purchasing, you can look at the marking printed on the insulation layer outside the wire on the lamp, and the cross-sectional area of the wire should be at least square.

First of all, identify from the appearance of the lamp. When purchasing lamps, consumers should first check the marks on the lamps and lanterns to determine whether they meet their own use requirements. 1) See whether the manufacturer's name and trademark, model, rated voltage, rated power, etc. are safe; (2) Identification from anti-electric shock protection:

Attention should be paid to protection against electric shock. (3) Identification of the cross-sectional area of the wire used in the lamp: the standard stipulates that the minimum cross-sectional area of the wire used on the lamp is squared, and some manufacturers in order to reduce costs, the cross-sectional area of the wire used in the product is only squared, in the abnormal state, such as the starting current in the fluorescent circuit can not jump, the whole line will work with the starting current, the starting current is larger than the normal working current, which will make the wire scorched, and the insulation layer will be burned out after the short circuit, resulting in danger.

Secondly, it is identified from the structure of the lamp. (1) The entrance and exit of the metal pipe through which the wire passes should have no sharp edge, and the measures can be chamfered or sheathed on the metal parts to avoid cutting the wire, causing the metal parts to be electrified and causing the risk of electric shock. (2) Whether the appearance of the structural parts of the lamp is worn or damaged; whether the fastener screws are tightly installed; Gently shake the lamp to see if there is any abnormal noise.

Finally, you can directly find the merchant to test, light up, and make the final function judgment. In short, when consumers buy lamps and lanterns, they should choose products with safety certifications as much as possible, and they must carefully identify and choose.

The LED light cup and gold wire will not affect its luminous brightness, and the main factor affecting the luminous brightness is the LED chip. The main factors that affect the life of LEDs are static electricity, solder joints, and heat dissipation conditions, which are directly related to gold wires and lamp cups. The luminous quality of LED products is also related to the technical level of the product's production process equipment and operators.

In the process of production and engineering construction, the 6 situations listed below will not only affect the luminous quality of LED products, but also directly affect the service life of LED.

The LED itself is not tightly encapsulated, so that moisture enters the interior and produces rust, damaging the packaging material of individual LEDs.

In the process of welding and assembly, it comes into contact with other materials and produces a certain chemical reaction, which is easy to cause a short circuit inside the LED during use.

The component leads after soldering are not completely cleaned.

The total resistance of the current-limiting resistors connected in series in the circuit is too small.

The screw holes of the fixed circuit board are too close to the copper street traces and pads, which makes it easy for the assembly screws to come into contact with the copper wires and pads when they deviate from the holes.

If the power cord is fixed in an inappropriate way (such as clamping the power cord in the middle with two rows of LED leads), the lead wire will rust and fall off under the action of external vibration force, and the solder joint of the LED lead will be loose or the pad will be separated from the printed board.

The luminous efficiency of LEDs.

1.Internal efficiency and external efficiency.

Luminous efficiency is the ratio of luminous flux to electrical power. The efficiency of LEDs is divided into internal efficiency (the efficiency of converting electrical energy into light energy near the PN junction) and external efficiency (the efficiency of radiating to the outside, and the internal efficiency is only used to analyze and evaluate the characteristics of the chip. The most important characteristic of LEDs is the ratio of the amount of light emitted (the amount of light emitted) emitted to the input electrical energy, i.e., the luminous efficiency.

Luminous efficiency characterizes the energy-saving characteristics of a light source, which is an important indicator of the performance of a modern light source.

2.Lumen efficiency.

Lumen efficiency is the main parameter to evaluate the characteristics of LEDs with external packaging. The high lumen efficiency of LED means that the energy of radiating visible light is larger under the same applied current, so it is also called visible light luminous efficiency. Table 2-1 lists the lumen efficiencies of several common LEDs (visible luminous efficiency.

How to distinguish the *** of LED lights is still not good? Mainly lies in the requirements of LED chips.

How to distinguish the *** bad of LED lights? Teach you to use this method, and if you learn it, you earn it.