www.hofoled.com

客户为什么要求高功率因素？

Pallong — Thu, 26 Jul 2018 19:59:51 GMT

功率因数即灯具输出有功功率的能力，到目前为止，华吉丰科技hofoled使用的电源都是高PF的，PF>0.9，认真为每位客户使用灯具着想。

如果选择低的功率因数的话，可能会对整个电力系统产生毁灭性的影响。而它究竟是如何影响着电力系统的呢?

1、 增加输电线路的电能损失；

当负载的功率因数小于1时，即电流与电压有相位差时，电流可分为两个分量，一个是与电压同相位的有功分量，另一个是与电压成90o相位差的无功分量。由于有功能量的传输是通过有功电流来实现的；而电源与负载之间交换的能量是由无功电流来实现的，当电压和有功功率一定时在不同的功率因数cosφ下电流的有功分量是不变的，而无功分量是随功率因数的变化而变化的，功率因数越低，则能量交换规模越大。当负载从电源接受的有功功率不变的情况下，输电线路的负载电流与负载功率因数的大小成反比，在输电线路线路参数不变的情况下，线路的总阻抗不变，而线路的功率损失又与负载电流的平方成正比，因此，输电线路上的电能损失也就同负载功率因数的平方成反比，既负载功率因数越小，线路的功率损失越大。

2、 使电源设备不能充分利用；

发电机、变压器的额定容量，是根据额定电压和额定电流设计的。额定电压和额定电流和乘积。它代表电机的额定容量在数值上等于允许发出的最大平均功率。当负载的功率因数小于1时，而发电机的电压和电流又不允许超过额定值，显然，这时发电机所能发出的有功功率较小，而无功功率则较大。无功功率愈大，电路与电源之间能量交换的规模愈大，发电机不能充分利用。同时，与发电机配套的原动机及变压器等也不能充分利用。例如，容量为1000kVA的发电机，如果cosφ=1时，能发出1000kW的有功功率，而在cosφ=0.7时，则只能发出700kw的有功功率。

3、 使线路电压降增大，降低电能质量；

当功率因数越低，输电线上输送的电流就越大，在线路上产生的电压降也就越大，电能质量降低，满足不了用户对电能质量的要求。为了提高电压，在电力系统中必须装设调压设备，如带电负荷调压器等。

4、 增加用户的电费支出；

从用户的角度，供用电规则规定，变压器容量在100kVA及以上的电力用户将执行功率因数调整电费。用户的负载功率因数越低，供电部门收取的功率因数调整电费越多，这样就大大的增加了用户的电费支出，从而增加了用户产品的生产成本。

隔离和非隔离电源的区别

Pallong — Thu, 26 Jul 2018 19:55:05 GMT

在一般的LED照明市场上，存在隔离型驱动电源和非隔离型电源之分。非隔离设计仅限于双绝缘产品，例如灯管，为了减少成本用非隔离的就会相对比较多，其中LED和整个产品都会密封在非导电塑料中，因此，最终用户并没有任何触电的危险。二级产品都是隔离型的，价格相对比较昂贵，但在用户可以接触到LED和输出接线的地方,通常在LED照明和路灯照明应用的情况下，这种产品必不可少。

带隔离变压器的LED驱动电源意味着LED可以直接用手接触而不会触电。而无隔离变压器的LED驱动电源虽仍可以借助防护外壳实现部分机械绝缘，但此时的LED在工作时并不能直接接触，存在着安全隐患。

什么是LED灯具的IP防护等级？

Pallong — Fri, 18 Jan 2013 16:15:35 GMT

在采购led灯具的时候，产品安全及质量是最受关注的项目，而led灯具市场上产品品类繁多，且同质化严重，这给LED产品的选择带来了一定的难度，其实简单来讲，只要了解一下防护等级IP级别，在产品安全方面你就心里有数啦！IP（INTERNATIONAL PROTECTION）防护等级系统是由IEC（INTERNATIONAL ELECTROTECHNI CALCOMMISSION）所起草。将灯具依其防尘防湿气之特性加以分级。这里所指的外物含工具，人的手指等均不可接触到灯具内之带电部分，以免触电。

IP防护等级是由两个数位所组成：

第1个数字表示灯具离尘、防止外物侵入的等级

第2个数位表示灯具防湿气、防水侵入的密闭程度，数字越大表示其防护等级越高

防外物侵入的等级划分：

0没有防护：对外界的人或物无特殊防护

1防止大于50mm的固体物体侵入：防止人体（如手掌）因意外而接触到灯具内部的零件。防止较大尺寸（直径大于50mm）的外物侵入。

2防止大于12mm的固体物体侵入：防止人的手指接触到灯具内部的零件防止中等尺寸（直径大12mm）的外物侵入。

3防止大于2.5mm的固体物体侵入：防止直径或厚度大于2.5mm的工具、电线或类似的细节小外物侵入而接触到灯具内部的零件。

4防止大于1.0mm的固体物体侵入：防止直径或厚度大于1.0mm的工具、电线或类似的细节小外物侵入而接触到灯具内部的零件。

5防尘：完全防止外物侵入，虽不能完全防止灰尘进入，但侵入的灰尘量并不会影响灯具的正常工作。

6防尘：完全防止外物侵入，且可完全防止灰尘进入

防潮防水等级划分：

0没有防护：没有防护。

1防止滴水侵入：垂直滴下的水滴（如凝结水）对灯具不会造成有害影响。

2倾斜15度时仍可防止滴水侵入：当灯具由垂直倾斜至15度时，滴水对灯具不会造成有害影响。

3防止喷洒的水侵入：防雨，或防止与垂直的夹角小于60度的方向所喷洒的水进入灯具造成损害。

4防止飞溅的水侵入：防止各方向飞溅而来的水进入灯具造成损害。

5防止喷射的水侵入：防止来自各方向由喷嘴射出的水进入灯具造成损害。

6防止大浪的侵入：装设于甲板上的灯具，防止因大浪的侵袭而进入造成损坏。

7防止浸水时水的侵入：灯具浸在水中一定时间或水压在一定的标准以下能确保不因进水而造成损坏。

8防止沉没时水的侵入：灯具无限期的沉没在指定水压的状况下，能确保不因进水而造成损坏

How to connect LED Tubes

Pallong — Tue, 02 Sep 2014 22:51:39 GMT

How to connect LED Tubes

With the advantage of engergy saving,much more bright,and long lifespan,LED tubes replace the traditional fluorescent lamps have been a trence.Here we like to introduce how to connect LED Tubes when install.

Precaution:Pls switch off power before doing any actions!

Method A

If lighting fixture’s wire connection is inductor ballast, installation as bellow:
Step 1. Remove the traditional fluorescent tube from the lighting fixture.
Step 2. Take out the inductor ballast from the lighting fixture.
Step 3. After take out the ballast, there will have two wires. One wire connects to right side and another wire connects
to left side.

Step4. Install VLIKE'S Led tube light into lighting fixtures.

Method B

If lighting fixture’s wire connection is Electronic ballast, installation as bellow.
Step 1. Remove the traditional fluorescent tube from the lighting fixture.
Step 2. Take out the starter and electronic ballast from the lighting fixture.
Step 3. After take out the ballast, there will have two wires. One wire connects to right side and another wire connect
to left side.
Step 4. Install VLIKE'S Led tube light into lighting fixture

LED Panel Light: A Window of Illumination

Pallong — Tue, 02 Sep 2014 19:18:05 GMT

The LED Panel Light is a rectangular frame of illumination that embodies everything stylish LED products represent. Featuring a sturdy and sleek aluminum frame, the lights are designed to not simply illuminate space, but to create it. From stylish nightclubs to hip eateries to the offices of Fortune 500 companies, the LED Panel Light is poised to make a tremendous splash in the worlds of architecture and design.

Whether its recreating a window-scape in your bedroom or radiantly bursting down an office corridor with LED illumination, the LED Panel Light outshines its competition with 72 half-watt Cree LEDs that show no “hot spot” anywhere on the lamp’s 21 inch by 21 inch lighting area. For this sort of quality and steadfast illumination, only Cree LEDs can deliver that luminosity to equally spread out the LED beams evenly and beautifully. The LED panel light comes with mounting hardware and a 24 volt AC adapter, so setting up the gorgeous display is as easy as 1-2-3! With 36 total watts of operating power, this LED panel light won’t tax your electricity bill either; the energy efficient LED panel light will deliver 50,000 hours of low-energy, bright and beautiful light.

The LED Panel Light can be used for general overhead office illumination to bathe your workplace in bright LED lighting that is leaps and bounds ahead of artificial, buzzing fluorescent lights. Recessed lighting has never been so convenient or breathtaking! The LED panel light can also be used as back illumination for your company logo or any other image. Just place a translucent image over the panel light and the lamp becomes an instant illuminated sign!

You can set up multiple LED Panel Lights side-by-side as well, for an illuminating “wall panel” effect that is simply out-of-this world! The solid construction of the panel lights ensures that the lamps won’t warp either, no matter where you choose to display these gorgeous lights. The neutral white lights operate at 4000 – 4500K color temperature 36W 600*600mm, 300*1200mm to recreate natural light at its most spectacular. This panel light is the dream of light designers, homeowners, and architects everywhere: an aluminum picture frame that streams light forth like a square translucent sun!

LED Panel Lights – changing the world, one wall at a time!

Reasons You Might Want To Use LED Bulbs

Pallong — Thu, 19 Jun 2014 19:15:02 GMT

LED bulbs consume less energy than the halogen and incandescent counterparts, yet yield the same output, or even more. For instance, an LED bulb consumes only 1/10 the amount of energy that an incandescent bulb would. This can lead to huge savings on your electricity bill. Better yet, if you put up solar powered LED bulbs, you could give your home a beautiful glow without any additional costs to your current electric bill.

One other advantage of using LED lightbulbs is that they run much cooler than other bulbs. Actually, they really only give off just light and no heat at all. This is a great way to illuminate the exterior of your home, where you have plants and other greenery that would be prone to catching fire if you utilized other lightbulbs.

LED bulbs are extremely durable. They simply don't die as fast as other lightbulbs. They are able to last up to 10 years. In addition, they are physically more tougher. For instance, you can drop an LED lightbulb and it typically won't break. Contrast this to incandescent, florescent, and halogen types, which are produced with glass and crack quite easily. LED bulbs are generally made from 1 solid piece of material.

It is obvious that LED bulbs are superior to other kinds of lightbulbs. They have a cheaper cost of ownership, are generally safer, are able to utilize the energy of the sun, and will last for years. These factors combine to make them more environmentally friendly because of fewer waste. So, you will be able to make your home more pleasing and at the same time you will be doing your part to help preserve our planet. welcome to view our website hofoled to inquire your interested lights.

LED Lighting Technology Could Change Home Lighting

Pallong — Wed, 15 Jan 2014 19:13:36 GMT

One of the best known trends catching on in lighting today is the use of Light Emitting Diodes, otherwise known as LED lights. Although this technology has been available since the 1960s, widespread use is increasing today due in large part to the technology's energy efficiency.

Without making it too complicated, LEDs work by transporting electrons through a semiconductor to create light. This single LED creates a solid light, as many people have seen on keychain LED lights; when a number of LEDs are grouped together, though, a high level of light can be achieved by using a fraction of the energy that would have been used otherwise. Compared to traditional lights, 80% of the electricity used by LEDs is transformed to light, whereas only 10% of the electricity used by incandescent bulbs is converted to light. This is the huge benefit of LEDs - their ability to produce the same level of light at a fraction of the energy cost.

LEDs are still rather high priced, though. Costing around 3 times more than an incandescent bulb, the initial purchasing cost is greater; this cost is made up for quickly in electricity savings, however.

Uses in the home are limitless; for example, in the kitchen, more under cabinet lighting is created using small LED "pucks" which illuminate a small area. These lights are strung together under the counter, creating a well-lit working area. In home lighting, LEDs possess the ability to do the work of the traditional light bulb in almost every situation, and often more efficiently.

Some of the advantages of LEDs over incandescent bulbs are obvious. Electricity savings are an area in which LEDs excel greatly, as well as their ease of installation. Along with this, LEDs last over 50 times longer than incandescent light bulbs. LEDs shine up to 50,000 hours or more at full luminosity. The durability of LEDs is another selling point, which is why LEDs are being used more in automobiles and in machinery. Newer vehicles are utilizing LED bulbs in the tail-lights so that they do not have to be replaced nearly as often and also due to the fact that they stand up to the vibration; since there are no filaments or fragile glass exteriors to shatter, LEDs are emerging as the first choice in demanding lighting situations.

In the home lighting realm, LEDs are a great choice because they do not burn out; rather, they gradually dim after around 50,000 hours. Interference is also immensely reduced as compared to fluorescents, which often interfere with televisions, phones, and audio devices.

More track lighting pendants are making use of the LED technology. Since the LED is a directional light, these are great for lighting areas such as an island in the kitchen or overhead lighting in a workspace such as an office.

Even though the initial investment is higher, it is worth the home lighting designer's time to look into the advantages of LED lighting. This technology is gaining support due to its durability, cost-efficiency, and long-life, and could one day replace the traditional light bulbs we are so used to.

Hofoled’s Light is your one-stop source for home lighting solutions and quality lighting fixtures. View the full catalog of products at www.hofoled.com .

The Many Uses For LEDs

Pallong — Thu, 17 Oct 2013 19:11:55 GMT

The LED, which stands for "Light Emitting Diode" is gaining more and more popularity for use in many applications and appliances. This is due to it's relative low cost, size and strength of light. Here are some of the many applications and items that use LED's:

LED Displays

Look around and you'll see LED signs on many businesses. One great example of LED light use is in Las Vegas. The giant multi color signs flashing messages, video clips and event information are seen outside just about every Las Vegas hotel. Another example is when you go to get gas. It's likely your gas station, if it was built somewhat recently, has an LED sign that allows the owner to change prices much more easily than the old manual signs made of plastic or metal.

LED Flashlights

From tiny key chain lights to huge, high powered lantern lights, flashlights are one of the most popular uses for LED lights. You may already have some LED flashlights in your home.
LED's for Traffic Safety.

When you pass an area of the highway that is under construction, it's likely that you'll see a flashing LED light steering you away from the area.

LED Lights For The Home

LED use is now skyrocketing in popularity in applications for the home. LED is now seen as an alternative to florescent lighting. LED products for use in the home include high output light bulbs, 12 volt DC light bulbs, lighting strips, under cabinet lights, light bars, reading lamps, office lamps, floodlights, security lights, lanterns, emergency lights, head lamps, book lights, solar powered lights, outdoor lights, motion detecting lights as well as many other light products for home use.

LED Novelties

You can find LED's used in many novelty toys and accessories like glow sticks, for instance. Yes, those sticks of light that you see kids using to go trick or treating on Halloween night, many of them use an LED. In addition, jewelry is a popular way to use LED. You can now see LED's lighting up items like bracelets, necklaces, earrings, hair accessories and rings. LED's have also made their way into novelty products like glasses, toy swords, toy guns, charms, wands and cheerleader accessories.

LED's for the Holidays

The holidays, especially Christmas, are one of the most popular times of the year to use LED lights. If you've bought Christmas lights recently, chance are that they are made of LED's. Another interesting use of LED lights for the holidays is a string of candle lights for the tree. In the old days, people would light their trees up with candles. Putting candles on a Christmas tree is very dangerous. However, with LED's, you can get the same look without the safety problem.

Surely many more LED applications and products will be available for use in the future. Welcome to visit www.hofoled.com (shenzhen hofo technology co.,limited ) to know more about LED Ceiling Light, LED Bulbs and LED Tube Light.

Save Our Planet with LED Lighting Systems

Pallong — Fri, 10 May 2013 19:10:13 GMT

Considering the pace at which our planet is being robbed of its precious resources, that day is not far when the entire world population will be engulfed by the heat of depletion. Saving energy is on everybody’s mind but very few steps were being taken to save our planet from dying a slow, painful death.

Of course, the scenario is beginning to change. Until a few decades ago, nobody really cared about carbon emission, ozone depletion or global warming. But the pronounced impact of energy depletion on the life of every individual has changed the mindset of the public for the better. A good percentage of the population is genuinely concerned about saving earth and are willing to do what it that takes to make our planet a better place to live for the next generation.

The arrival of LED lighting systems and their increasing popularity as an energy efficient solution is the revolutionary initiative of the 21st century. LEDs first made their appearance in 1920 but their use was limited due to the high cost involved. Technological breakthroughs however, helped lower the cost of LEDs, making the technology affordable for everything from traffic lights and billboards to home lighting and halogen lamps.

Lighting is responsible for one-fourth of all energy consumptions around the world. By using energy efficient LED lighting systems for just one-twentieth of all the homes in the United States, the government can definitely, avoid the need for 13 new medium-sized (300MW) power plants every year. At the same time, the total associated greenhouse gas emissions can be lowered by up to 160 million metric tons annually, thus saving our planet from further depletion of natural resources.

LEDs offer double the efficiency of CFLs or Compact Fluorescent light bulbs that are commonly used as a green alternative in most buildings. The total absence of toxic mercury, incredibly long lifespan and faster turn-on times are other green features that make LEDs more appealing than other lighting solutions. It has been estimated by the Department of Energy that by the year 2025, LEDs could reduce national energy consumption for lighting by 29 percent, saving 125 billion on the electric bills of U.S. households.

As part of the “Save our Planet” campaign, many American cities have begun to replace street lights and parking structures with LEDs. Once this transition has been fully implemented at each and every U.S city, in less than 20 years, our planet will reveal a healthier, greener façade.

Even the car industry is switching over to LED lighting systems, especially for indicator lights on the dashboard and rear lights. A recent study suggested that if LED lights are used instead of conventional car lights, power consumption can be reduced by 90 percent for the same intensity of light. While standard halogen lights use 0.8 percent of the car's fuel consumption, LEDs use merely 0.1 percent.

LED lighting systems are making it increasingly convenient and affordable to make our planet greener by reducing the environmental impacts that have been depleting the earth’s natural resources beyond recognition.

Patented Driverless LED Bulbs to replace traditional lamp

Pallong — Thu, 25 Apr 2013 19:08:39 GMT

What is driverless? What is a driver?

In ordinary LED bulbs,the driver converts 240 volt AC mains power to DC volts,which LEDs can use.It is complicated device typically containing more than one hundred electronic parts: capacitors,resistors,temperatures sensors and chips.These generate significant amounts of heat.

Our measurements of competitor bulbs reveal temperatures,averaged over the bulbs,between 60°C to 80°C.This is electricity wasted in the production of heat,not light.

That's not only problem with normal LED Bulbs.The reason they can't guarantee long service life is that the driver is always the first part to fail.The large amount of heat emitted by the driver itself means that capacitors begin to dry out and circuit connectors fail,and typically,a three year service life is all that can be expected.

Hofo's driverless design has removed this weakness from the bulbs.NO capacitors,NO resistors,NO mosfets and NO WEAKNESSES.

Hofo's driverless bulbs available in 5 years warranty backed by our factory!