What is COB?

COB 
COB (Chips on Board) , is a new technology of LED packaging for LED light engine. Multi LED chips are packaged together as one lighting module. When it light up, it looks like a lighting panel..                                       

Why COB? --Background
LED(light emitting diode) is new technology with advantage of saving energy and very long lifespan. But all LED lightsource can not be faultless especially SMD, HP, flux LED etc. Compare to traditional lighting such as fluorescent lamp, as it is super bright in a small size, it cause uncomfortable glare. In case of no diffused optical lens used, such LEDs usually cause glare and zebra strips . But when optical lens or cover used, it will cause light loss when LED beam pass through this lens or cover.


How COB LED Light source works 

COB LED is multi chips packaged, it can 10 times more increase lighting area, so it avoid uncomfortable glare by the maximum extent. 
Lightspot use small size of chips to make COB LED package.
By now, for small size chip, ?some famous LED chip manufacturer can reach 249lm/watt @ 20mA. But big size LED chip can only reach 161lm/watt @350mA. The light efficacy decrease when chip size is bigger. Also when LED driver increase current to LED, the light efficacy per watt is even low.

The COB with small size chips will be a trend of LED light source package.

Lightspot holds the patent for invention for COB LED and lamp.

Advantage of COB 
COB LED has a lot of advantges. For details of advantage of COB, click http://www.cob-led.com/http://www.cob-led.com/COB-LED-Advantage-Chip-on-board.html

Application of COB Technology 
1, COB LED light sources

2, LED lighting fixture which use COB LED light source

What’s COB LED?

POSTED ON AUGUST 12, 2013 BY ADMIN IN LED COMPONENT, LED KNOWLEDGE WITH 10 COMMENTS

COB LED means chip on board LED, it’s one of bare chip technologies, which interconnect bare chip to substrate by conductive or non-conductive adhesive, and then wire bonding to achieve its electrical connection. COB package is attach number of chips directly to the substrate, then packaged together by silica gel, epoxy resin or other materials, the yellow part is phosphor.

Produce process:
The first step of COB package is to cover wafer placement point on the substrate surface by thermal conductive epoxy (usually is epoxy resin mixed with silver particles). Second is put the wafer on the substrate surface directly, then fix wafer to the substrate firmly by heat treatment. Third is to establish electrical connection between wafer and the substrate by wire bonding method.

COB LED advantages:
COB light source can save about 30% cost in the application, mainly lie in LED package cost, light engine production costs and the secondary light distribution costs, which is great significance for applications and promotion of semiconductor lighting.

In performance, through the rational design and micro-lens molding, COB light module can avoid the defects of point and glare light also other flaws existed in discrete light source device. It also can add some red chips appropriately, so that to improve the CRI effectively under the condition of without reduce light efficiency and lifetime significantly.

In application, COB module makes production of lighting manufacturer more simple and convenient, and reduces cost effectively. In production, the existing technology and equipment can support high yield and large-scale COB module manufacturing.

With the development of LED lighting market, lighting demand is growing rapidly, according to different inquires of lighting applications, we can produce a series COB light source module for mass production.

COB LED disadvantages:
COB packaging technology bottleneck is how to improve the reliability of the light source, and its operating temperature. However, most of the current market COB packaging companies are small and they mostly use aluminum substrate as the material. Aluminum COB reliability is low because of its greater thermal resistance, easy to cause death LED or high light attenuation. The ceramic substrate is an ideal COB material, but its cost is relatively high, especially for the power less than 2W, difficult to be accepted by customer.

Also, the demand of COB light source on the market is still low by now. In addition, COB LED exist standardization issues, the standards of package manufacturers and lighting factories are not the same, so the two parties have difficult in integration.

Application:
Currently, the main applications for COB LED are and mining lamps, spot lights, street lights and so on. 

2.Five Popular Single row led light bar in the market

While you are behind the steering of your vehicle, you shall always want to have the best feel and experience whilst driving and that will only happen if you have the best and clear visibility on the road

A high quality light bar can make a significant difference in your ability to see clearly and drive safely on the darkest roads.

If you are looking for the best light bar to improve visibility on your daily drive, it is wise to research the best products and developing technology.

In this guide we feature comparisons of LED technology, explain why certain products are superior, provide tips on how to choose the best unit and much more. You will learn the characteristics of a quality light bar in order to distinguish it from a cheap model. 

Before making a final decision on the type of LED light bar you want to buy carry out a background research and do comparison between the various brands of LED light bars in the market to determine their quality and prices.

Learn to differentiate between high quality LED bars, though those may be a little bit expensive and the low quality cheaply made ones. This knowledge will ensure that you always get the best product for your bucks.

Single row led light bar vs double row led light bar?

Light Bars have been widely used for offroad ,truck ,tractor, utv ,suv ,atv ,4x4 ,while the vehicle owners are still confused how to distinguish them

Almost every vehicle owner knows that having extra illumination at night can be a huge advantage. You can easily see what's in front of your car. What's more, having extra illumination can also come in handy in emergency situations. These are some of the reasons why people purchase light bars for their vehicles. With the extra illumination provided by the lighting devices, they can avoid accidents and ensure their safety at night.

If you're planning to purchase such lighting devices, keep in mind that there are two major types of LED light bars: single row and double row led light bars. While they basically offer the same functionality, there are certain differences between the two of them when it comes to features and structural design among other things.

So what are the difference between a single row LED light bar and a double row LED lightbar? As the name implies, a single row LED light bar is basically composed of a single, horizontal row of LED light bulbs. And when it comes to style of illumination, it has a little less flood beam but it produces better spot beam. This makes a single row LED an ideal choice if you want your lights to reach farther distances.

A double row LED light bar, on the other hand, has two horizontal rows of LED light bulbs that sit on top of each other. If you need wider coverage of illumination, purchasing a double row LED is your best bet. Double rows produce better flood style of illumination as compared to single row LEDs.

Although single row light bars have a single row of LED light bulbs in them, it doesn't necessarily mean that they are less powerful than double row light bars. A 120-watt single row LED and 120-watt double row LED are both capable of producing lights with the same brightness.

Sure, a single row may have fewer light bulbs as compared to a double row. However, each light bulb has higher wattage than those found in a double row light bar. For instance, if the single row light bar has 12 LED light bulbs, each bulb will have a power of 10W. Whereas if the double row light bar has 40 LED light bulbs, each bulb will have a power of just 3W.

Meanwhile, you're probably wondering what's this flood or spot style of illumination is all about. Well, these two lighting types produce significantly different beams intended for very different purposes. Basically, the width of the beam distinguishes floodlights from spotlights.

People choose and buy light bars with more flood beam if they want to illuminate a wider area. In contrast, light bars that have more spot beam on them are used to illuminate specific points because they can cover farther distances. In addition, lights that product spot style of illumination appear brighter than floodlights, even if they have the same wattage. It is because they produce highly concentrated beams of light as compared to those with flood style of illumination.

Not only care about the power or lumen anymore ,know your purpose of the light bars and then it is clear for you how to choose suitable light bars for your vehicle

2.Technical Specification should pay attention when choosing the Single row led light bar?

No matter you are the first time to buy led light bars or you have bought for several times ,do you feel confused and hard to choose it ? Cause you don’t know which parts should pay attention to ,maybe something is similar to you

Size

The first most important factor you will want to consider is what size light bar you want. The larger a light bar is, the more bulbs it will have, meaning that the bigger you go the brighter your light will be. In spite of this, there are plenty of smaller LED light bars that still produce tons of light. LED light bars range in size from 4 inches all the way up to 52 inches, and which one is best for you really depends on your vehicle,your budget and the position you want to install

Shape

Deciding whether to purchase a curved LED light bar or a straight LED light bar is really a matter of personal preference. With neither shape having a clear advantage over the other, the choice is a matter of aesthetics. Pick which shape appeals to you most and go from here.

Number of Rows: Single or Double Row LED Light Bar

LED light bars either come equipped with a single row of LED bulbs or two rows of LED bulbs. Double row light bars are obviously going to produce more light, and though they are a little pricier, are usually the preferred choice of the two. If you are looking for a low-profile LED light bar, however, you will probably be limited to a single row of LEDs. Though the double row lights are brighter, which type looks best really depends on your vehicle and your personal tastes.

Beam Pattern: Spot, Flood or Combination

The beam pattern of an LED light bar refers to how wide of a beam the light produces. Spot beams are much narrower and reach a longer distance, making them preferred for on-road driving. Inversely, flood beams are much wider, and since obstacles at the side of the road are more of a concern on a backroad trail, the best off road led light bar is one that is equipped with flood beam bulbs. To be covered no matter the situation, consider purchasing an LED light bar with a combination beam pattern that is equipped with both flood and spot LEDs. This is a highly popular choice, and most of the best LED light bars available today come with both spot and flood LED bulbs.

LED Color

Certain colors are advantageous for certain situations. White light, for example, is the brightest color and is the best for most driving situations. Amber light, however, is better for fog and low visibility conditions since it does not reflect back into your eyes. Colors such as blue and red are good attention-getters and are preferred for emergency vehicles. Besides these, there are a also a variety of colors such as green that are made purely for aesthetic value. Like beam patterns, some light bars come equipped with bulbs of multiple colors. Choosing which color works best for you is a matter of intended purpose as well as personal tastes.

Water Resistance

Between rain showers and mud puddles, your LED light bar is certain to get soaked. If you are searching for the best LED light bar for marine uses, this is even truer. In order to make sure that water doesn’t corrupt the electronics inside your light bar, you will want to purchase a light that is completely water resistant. In order to see how much protection a light offers against water, check its IP rating. An IP rating of IP68 or IP69 are both excellent ratings, with IP69 being the highest possible. These ratings ensure that your light is able to survive complete submersion without allowing water to penetrate through to the electronics inside.

Connector Type

Wiring up an LED light bar doesn’t have to be a complicated task, but to make the process go smoothly, you will want to make sure you have the right connectors. All LED light bars either come with ATP or DT connectors. Match this connector type with your wires and you will be all set to mount your light.

Voltage

While every light bar is made to run off of a standard 12V battery, there are still three different voltage levels that they come in—12V, 24V, and 48V. Generally, the more voltage a light bar is rated for, the brighter it will be and the more power it will consume.

LED Chip

Usually there are CREE ,Epistar ,Philips ,OSRAM led chip for light bars ,CREE and Epistar is the most widely used. CREE is with higher luminous attenuation and high quality ,Epistar is with good price relatively.

Any more questions ,welcome to contact the led light bar factory