Understand The Basic Parameters Of LED Lighting Products

Understand the basic parameters of LED lighting products

When we choose or purchase lamps, we often pay attention to the relevant parameters of the lamps, such as: brightness, life, color temperature, etc., as a standard to distinguish the advantages and disadvantages of the lamps. But do you know enough about the parameters of the lamps? Here is an explanation of the common parameters for the majority of buyers, so that everyone can choose their favorite LED lighting fixtures when buying.

1. Brightness
The brightness of the LED light is the parameter that users care about most, and the brightness can be explained from two aspects.
Luminance L: The luminous flux per unit solid angle per unit area of the luminous body in a specific direction. Unit: Nit (cd/㎡).
Flux φ: The total amount of light emitted by the luminous body per second. Unit: Lumens (Lm), which means how much the luminous body emits light. The more luminous the light, the greater the number of lumens.

2. Lifespan
The life of lamps is usually related to quality, and the difference in quality is the key to the length of life. Life is determined by light decay. LED products usually do not fail suddenly, but the light output will decrease over time. The usual practice is to measure the lifetime from a 30% reduction in output (that is, 70% of the remaining light output). This is commonly referred to as "L70 life" and is measured in hours.

3. Wavelength
LEDs of the same wavelength have the same color. The spectral wavelength distribution of several commonly used ultra-bright LED lights is 460～636nm, and the wavelengths appear from short to long as blue, green, yellow-green, yellow, yellow-orange, and red. Typical peaks of common LEDs of several colors The wavelengths are: blue-470nm, blue-green-505nm, green-525nm, yellow-590nm, orange-615nm, red-625nm.

4. Color temperature
The color temperature of a light source is defined as the Kelvin temperature of a black body radiator that emits light similar to this light source. Color temperature is the unit of measurement to identify the color of light, that is, the K value. Yellow is "below 3300K", white is "5300K and above", and intermediate colors are "3300K-5300K". Customers can choose the appropriate color temperature of the light source according to their own preferences and the needs of the environment.

Of course, the parameters of LED lights are more than these. For example, strobe, heat dissipation, light efficiency, etc. are all relevant parameters for judging the quality of LED lights.

There are also many applications for led lights, such as outdoor fixed led display, and outdoor fixed large-scale digital signage can be used in various advertising venues, such as stadium video review, dozens of storey shopping malls, etc. There are also many applications such as led solar flood light and so on.

Knowledge Of LED Drive Power

Knowledge of LED drive power

At present, LEDs are driven by DC, so a power adapter, that is, LED driving power, needs to be added between the mains and the LED. Its function is to convert the AC mains into a suitable DC power for the LED. According to the power rules of the grid and the drive of the LED Characteristic requirements, the following points should be considered when selecting and designing LED drive power supplies:
1. High reliability
Especially like the driving power supply of outdoor LED street lights, it is installed at high altitude, which is inconvenient to maintain and costly to repair.
2. high efficiency
LED is an energy-saving product, and the efficiency of the drive power supply should be high. It is especially important for the structure of the power supply installed in the lamp. Because the luminous efficiency of the LED decreases with the increase of the LED temperature, the heat dissipation of the LED is very important. The efficiency of the power supply is high. , Its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of the LED.
3. High power factor
The power factor is the requirement of the power grid on the load. Generally, there is no mandatory indicator for electrical appliances below 70 watts. Although the power factor of a single electrical appliance with low power is lower, the impact on the power grid is not large, but everyone lights up at night, and similar loads are too concentrated , It will cause serious pollution to the power grid. For 30 watts to 40 watts of LED drive power, it is said that in the near future, there may be certain indicator requirements for power factors.
4. Drive method
There are two types currently in use: one is a constant voltage source for multiple constant current sources, and each constant current source individually powers each LED. In this way, the combination is flexible, and one LED fails, and it does not affect the work of other LEDs. , But the cost will be slightly higher. The other is direct constant current power supply, LEDs run in series or in parallel. Its advantage is that the cost is lower, but the flexibility is poor, and it must solve the problem of a certain LED failure without affecting the operation of other LEDs. These two forms will coexist for a period of time. The multi-channel constant current output power supply method will be better in terms of cost and performance. It is also the mainstream direction in the future.
When we design the LED drive power supply, it is necessary to know the LED current and voltage characteristics. Due to the different LED Lights manufacturers and LED Lights specifications, the current and voltage characteristics are different. Now take the typical specifications of white LEDs as an example, according to the current and voltage changes of the LED According to the law, the general application forward voltage is about 3.0-3.4V, the typical value voltage is 3.2V, and the current is 60mA. When the forward voltage applied to both ends of the LED exceeds 3.6V, the forward voltage will increase slightly, and the positive The current may increase exponentially, causing the temperature of the LED luminous body to rise too fast, thereby accelerating the light attenuation of the LED, shortening the life of the LED, and even burning the LED in severe cases. According to the voltage and current change characteristics of the LED, the impact of the driving power supply The design puts forward strict requirements.
At present, the LED lamp products produced by many manufacturers (such as guardrails, lamp cups, and projection lamps) use resistance and capacitance to step down, and then add a zener diode to stabilize the LED to supply power to the LED. This way of driving the LED has great defects.

How do we custom metal display products

 Metal is a kind of general hard materials. it includes middle steel, iron, steel, stainless steel, aluminum alloy and zinc alloy etc. The material can be designed all kinds of forms of sheet, tubes, rods, wire and meshes etc.

Metal processing is in cutting, bending, folding, welding, milling, grinding, punching with a complete list of in-house machines including rolling machines, metal sheet bending  machines, bending machines, welding machines, punching machines, drilling machines, grinding machines and other small auxiliary machines.

The following are common uses for metal displays:

1. Wall display, such as wall hooks, frames, panels, shelves, display stands, brackets, etc.

2.Display shelving for retail stores, magazine racks, merchandise racks, containers, trash cans, trash cans, shopping carts, store counter displays, etc.

3. Trade show displays, store fixtures, metal parts for other POP displays, etc.

4.Floor display independently.

5.Endcap display.

6. Gondola display: frame, column, shelf, bracket, hook, clip, etc.

7. Counter Display: Suitable for any retail area, including shoe display rack, hat display rack, bag display rack, jewelry display rack,cosmetic display stand, etc.

What should purchase rackings be aware of?

 What should purchase rackings be aware of? This is a concern for many buyers, warehouse rackings are mainly used to store goods, and sometimes do not need to pay as much attention to the appearance of the racking products as other goods.  Simply , there are some problems to be aware of. 

1. The stability of rackings has always been one of the key problems in the design of racking steel structure, and the wide application of racking steel structure system highlights the importance and urgency of stability research. Because there are many uncertainties in the design, construction and use of warehouse racking steel structure system, it is necessary to introduce reliability analysis.   

2. The rackings must choosed suitable for the characteristics of your warehouse, so before buying, be sure to plan for yourself, or let the racking factory professional and technical personnel for you to tailor-made, so that the utilization rate of your warehouse will be greatly increased, will also let the possibility of problems may appear in the future down to low.   

3. Process issues. The raw parts after the racking are formed should go through degreasing, rust removal, pretreatment, phosphation, passivation, electrostatic spraying, high temperature curing and other processes. The quality of the powder is also divided. Generally each racking company has standard colors, spraying standard colors generally in low cost. If you use a special color, powder change will increase the duration, waste powder, so the cost will be relatively high.  

4. Supermarket shelvings are commonly divide into three kinds, one is a single-sided back-net is also a double-sided back-net, there are angle steel shelvings,, floating shelvings are also used. The specific model rules are based on the graphic design of the supermarket and the placement of the products. Warehouse rackings  are roughly divided into four kinds, heavy duty rackings, medium duty rackings, light duty rackings, as well as angle steel rackings, the specific rules are based on the scale of the warehouse, height, and the items to be placed.

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What is the difference between nanosecond laser cutting machine and picosecond laser cutting machine

What is the difference between nanosecond laser cutting machine and picosecond laser cutting machine?

Nanosecond UV laser, with a common wavelength of 355nm, has a higher unit energy density after focusing, which can destroy the bond between the atoms of the material and cut the material. This makes the processing of organic materials and the precision processing of various ceramics possible. It is widely used in soft board drilling and appearance cutting, circuit board cutting, ceramics and LTCC drilling and segmentation, etc. combined with the data processing software circuitcam and the device driving software dreamcreator, the processing path is changeable and the parameter setting is arbitrary, highlighting the advantages of UV laser.

However, although UV laser processing relies on the so-called photochemical mechanism, it is still inevitable to release heat. For the precise, micro and non-interference processing requirements of heat sensitive materials, for example, the forming of soft plate with gold finger, the blind hole processing of thin bottom copper soft plate, the drilling of side wall quality ceramics, the deep processing and micro processing of various metals, and the cutting and processing of glass, the effect is not ideal. In the processing process, local rapid heating, melting and vaporization are easy to cause defects such as burr, recrystallization, microcrack and so on.

The birth of picosecond laser gets rid of the thermal influence accompanying laser processing, and makes the laser technology enter the era of cold processing. In one second, light can reach the lunar surface from the earth, but in one picosecond, such high-speed light can only run over the distance of three hair diameters. Compared with nanosecond laser, if the total energy is equal, the laser peak power and energy density of a single picosecond laser pulse are thousands of times higher than that of a single nanosecond pulse, Almost all of them are above the processing threshold of any material. The same amount of energy is compressed and released within one thousandth of a nanosecond, with almost no transmission, refraction and heat conduction loss. As shown in the left figure, it is all used for "useful work" of processing materials. Even if the laser pulse with infrared wavelength is used, the thermal influence can be ignored. Picosecond laser can directly cut metal layer, copper foil layer, adhesive layer and PI / PET film layer, The cut surface is smooth and clean, the layers between different materials are clear and tidy, and there will be no common phenomena such as carbonization, micro shortness, glue shrinkage and nodulation in nanosecond laser cutting, which can be avoided in the process.

Fusen laser series equipment can be equipped with flight processing module, scanning and cutting at the same time. Continuous scanning technology increases the effective processing time. The optimized high-performance ultrashort pulse laser source is matched with high-performance mobile system and series platforms suitable for different types of products, so as to optimize the processing speed of the equipment and expand the production capacity. High performance machine, equipped with optical system, mobile system and material loading table according to the needs of high-end applications, is suitable for precision and micro processing, including top-level digital scanning galvanometer and high-precision telecentric lens, accurate camera positioning system, non-destructive linear mobile system granite base and multi-purpose fast loading table. It is not only suitable for repetitive mass production processing, but also convenient for single piece experimental exploration.

Fusen laser cutting equipment system is equipped with standard industrial interface, which can be integrated into MES system. Support operation data collection, machine distribution, product tracking and distribution. They can set different user levels according to needs. The operation authority of each level is different, divided into operation and maintenance levels, so as to facilitate equipment management and maintenance.

Fusen laser depaneling machine system can be equipped with automatic loading and unloading devices (mechanical arm and automatic loading and unloading from roll to roll and roll to sheet) to facilitate integration into the production line, realize no manual operation, save labor cost and improve production capacity!