What are COB LEDs?
Relatively new to the LED market, chip on board (COB) LEDs offer many advantages over the standard options. COB LEDs are basically multiple LED chips (typically nine or more) bonded directly to a substrate by the manufacturer to form a single module. Since the individual LEDs used in a COB are chips and not traditionally packaged, the chips can be mounted such that they take up less space and the highest potential of the LED chips can be obtained. When the COB LED package is energized, it appears more like a lighting panel than multiple individual lights as would be the case when using several SMD LEDs mounted closely together.
Advantages of COB LEDs
Being multi-chip packaged, the light emitting area of a COB LED can contain many times more light sources in the same area that standard LEDs could occupy resulting in a greatly increased lumen output per square inch.
COB LEDs use a single circuit with just two contacts to energize the multiple diode chips it houses. This results in fewer components required per LED chip for proper operation. Furthermore, the reduced components, along with the elimination of the traditional LED chip structure packaging, can reduce the heat generated from each LED chip. The ceramic/aluminum substrate of COB LEDs also acts as a higher efficiency heat transfer medium when coupled to an external heatsink, further lowering the overall operating temperature of the assembly. When mounting a COB to a heatsink, care must be taken to choose a heatsink capable of dissipating the heat generated to enable a COB to be used to their full potential. In the long run, the proper heat dissipation increases efficiency and lowers failure rates.
Another aspect of COB LEDs that reduces failure rates is the fact that spot soldering of the individual LED chips is not necessary as each chip is directly mounted onto the substrate. The smaller amount of welding points results in lowering the rate of failure.
Light loss is decreased significantly and viewing angle is increased both due to the fact that lenses and other traditional LED packaging parts are no longer in place when using COB LEDs.
WHAT IS LED?
A light emitting diode (LED) is a semiconductor device which can create a light source of various colors utilizing a compound semiconductor material such as GaAs, AlGaAs, GaN, InGaN, and AlGaInP. SMD housings generally feature an LED chip connected to multiple metal leads formed from a leadframe and can optionally include a heat slug.
SMD LEDs are named by their sizes. SMD 2835, for example, the most well known SMD configuration on the market and offers the best cost .💡
performance among the SMD packages, are called this way because the dimensions of the chips are 2.8mm x 3.5mm. Other SMD chips available on the market including 3014, 3528, 4014, 5050, 5630, 5730, etc. Typical lighting products for LED chips packaged within SMD housings include for example, but are not limited to, LED light bulbs, LED tubes, LED panels, LED linear light fixtures, LED strips, LED downlights, LED flood lights, ...
WHAT ARE SMD LEDS?
An SMD LED Module (surface-mount device light-emitting diode module) is a type of LED module that uses surface-mount technology (SMT) to mount LED chips on printed circuit boards (PCB). It is a self-contained surface-mount LED device designed either to function on its own or to plug into a compatible unit.
Other types of LED lighting that are not SMD are the newer and more powerful luminescence COB (chip on board) and MCOB (multi-COB), finally there are the older DIP LEDS, "Dual In Line Package", DIP LED providing only low luminescence.
SMD LED modules are widely used, in LED lamps, for backlighting, home illumination, shop-windows, advertising, automobile interior lighting, Christmas lights, and numerous lighting applications.
Benefits of SMD
SMD downlights produce a wide spread of light. It floods light everywhere which in turn means there is a higher glare. Their wide beam angle means they are suitable for larger rooms like living rooms, bedrooms, kitchens and bathrooms.
Which is the best in LEDs?
LEDs like 3528s, 5050s, 2835s and 5630s aren’t really different types of chip at all – they’re simply different sizes. Each has its own spec: different power requirements and output brightness. The best choice depends on what’s right for your project.
You can find out more about each LED chip below.
15 Advantages of LEDs
1. LED Light Lifespan:
Easily the most significant advantage of LEDs when compared to traditional lighting solutions is the long lifespan. The average LED lasts 50,000 operating hours to 100,000 operating hours or more. That is 2-4 times as long as most fluorescent, metal halide, and even sodium vapor lights. It is more than 40 times as long as the average incandescent bulb..
2. LED Energy Efficiency:
LEDs generally consume very low amounts of power. The statistics to look for when comparing the energy efficiency of different lighting solutions are called by one of two terms: luminous efficacy or useful lumens. These two items essentially describe the amount of light emitted per unit of power (watts) consumed by the bulb. In our experience most LED lighting retrofit projects result in a 60-75% improvement in the overall energy efficiency of the facility’s lighting. Depending on the existing lights and the particular LEDs installed, the savings could be more than 90%. You can read a few case studies here.
3. Improved Safety With LEDs:
Safety is perhaps the most often overlooked advantage when it comes to LED lighting. The number one hazard when it comes to lighting is the emission of heat. LEDs emit almost no forward heat while traditional bulbs like incandescents convert more than 90% of the total energy used to power them directly into heat. That means only 10% of the energy powering incandescent lights is actually used for light (which also makes them extremely inefficient compared to LEDs). Additionally, because LEDs consume less power they can operate effectively on low-voltage electrical systems. These are generally much safer in the event that something goes wrong.
4. LED Lights Are Physically Small:
The actual LED device is extremely small. Small power devices can be less than a tenth of a single mm2 while larger power devices can still be as small as a mm2. Their small size makes LEDs incredibly adaptable to an infinite number of lighting applications. Different uses for LEDs include a wide spectrum from their roots in circuit board lighting and traffic signals to modern mood lighting, residential and commercial property applications, and even major stadium lighting.
5. LEDs Have Great Color Rendering Index (CRI):
CRI is a measurement of a light’s ability to reveal the actual color of objects as compared to an ideal light source (natural light). High CRI is generally a desirable characteristic (although of course, it depends on the required application). LEDs generally have very high (good) ratings when it comes to CRI.
Perhaps the best way to appreciate CRI is to look at a direct comparison between LED lighting (with a high CRI) and a traditional lighting solution like sodium vapor lamps (which generally have poor CRI ratings and are in some cases almost monochromatic).
6. LEDs Generate Directional Emissions:
LED technology emits light for only 180 degrees. Every other type of light emits light 360 degrees around the source. 360 degree emissions necessitate accessory devices to reflect and/or redirect the light. This drives up the costs for the system in general and inevitably results in losses meaning that the device is necessarily less efficient than it otherwise would be. Consider a light that emits light into the ceiling - that is your standard bulb. The problem is that you’re trying to illuminate the room, not the ceiling. LEDs solve this problem completely and give the savings back in terms of the system’s overall energy efficiency.
7. LEDs Have Tremendous Design Flexibility:
Because LEDs are so small they can be used in virtually any application you can think of. They can be combined in bunches for a traditional bulb, used in isolation as a small device light, or strung out in sequence in a linear fashion. Just about everything you can think of can be done with LEDs.
8. LEDs Are Solid State Light (SSLs):
LEDs are solid state lights. This means that the traditional glass bulb surrounding the light is entirely unnecessary.
9. LED Dimming Capability:
LEDs are able to operate at a virtually any percentage of their rated power (0 to 100%). Of note, they do require hardware specific to LED technology in order to dim (meaning you cannot use the dimming equipment for an incandescent bulb or other traditional lighting technology). A positive of operating LEDs at less than full power is that they get more efficient as the power is reduced. This also increases the total lifespan of the light itself. Both of those advantages are absent with technologies like metal halides that actually get less efficient at lower power and in many cases cannot be dimmed at all.
10. LEDs Provide Instantaneous Turn On & Do Not Have Issues With Frequent Switching:
LEDs turn on and off instantaneously. There is no warm-up period like in the case of metal halide lamps. Additionally, frequent switching doesn’t cause degradation in the device.
11. LED Lights Are Environmentally Safe:
LEDs do not have the environmental issues common to traditional lighting solutions like fluorescent or mercury vapor lights. Both of these traditional solutions contain mercury internal to the bulb and thus require special handling at the end of the product’s useful lifespan. None of these considerations are necessary with LEDs.
12. LEDs Produce Virtually Zero UV Emissions:
LEDs emit the vast majority of their energy in the visible spectrum, a small amount in the infrared spectrum, and virtually none in the ultraviolet portion of the spectrum. This means that LEDs are able to safely and reliably illuminate UV sensitive items like art that will break down and degrade over time if exposed to this type of emission.
13. LEDs Operate On Very Low Voltage:
In many cases LEDs operate on very low voltages. This makes them suitable for use in outdoor lighting applications where other lighting might not meet code such as with oceanfront homes where the ground level of the property is in a flood zone.
14. LEDs Operate Well In Cold and Hot Temperatures:
LEDs work well in a wide range of operating temperatures without significant degradation.
15. Correlated Color Temperature (CCT):
LEDs are available in a wide range of correlated color temperature (CCT) values. They can be purchased with a “warm,” yellowish glow, as a “cool,” white light and a variety of other options.