What is the advantage of K-COB?

Current packaging solution for white light

Packing type KCOB (Maximum power for single-chip could reach 1000w) COB (Maximum power for single chip is around 200w and it's extremely unstable) SMD (2835,3030,5050 are popular among white light)
Chip Pics  L28+38 (2)  L28+38 (1) L28+38 (1)
Advantages 1. Long time lifespan;-8 years
2. Low lumen decay: (10%~ 5years);
3. 15% smaller than COB;
4. Extremely low CCT optional;
1. Low cost;
2. Good for light distribution design;
1. Stable quality;
2. Wide beam angle;
3. Current Mainstream product;
Manufacturing process Wafer treatment->D/B->W/B->Barrier creating->Ceramic covering->Binning test->packing D/B->W/B->Barrier creating->Silicone dispensing->Binning test->packing D/B->W/B->Silicone dispensing->Binning test->packing
Application 1.High power lamp;
2.Spot lighting(Hall lighting);
3.Special lighting;
4.Road lighting
1. Indoor-lighting;(Low wattage)
2. Medium power lighting;(30~150w)
1.Indoor lighting;(Low wattage);
2.Road lighting;
Remark KCOB would be suitable fishing lights, golf lighting, stadium lighting, trains lights, car lights, and some special applications SMD has high power(1.5~2.5W)/3030/5050 for outdoor products. Price differences are big.

Typical parameters for LED lighting

1.Luminous flux/lumen(lm): Output brightness of luminaire (lamp);
 2.Lumen efficacy(lm/w): Total luminous flux/power,few SMD could reach 150lm/w maximum;Regular KCOB product is around 120lm/w (customize available);
3.Color temperature/CCT(K): The color of light. Lower of the CCT, the light is more yellow/warm


Warm white(WW)

Natural white(NW)

Daylight white(Cool white)


2300~2700k(KCOB could be 2200k)








1. For LED, the higher of the CCT, the higher of the lumen efficiency; 

2. Lower of the CCT, higher of the CRI;

3. Lower CCT has stronger penetrability from the fog. So in China, most of street lights are warm white;

4. European prefer warm white more than white light sometimes, especially indoor products;

5. LED of high CCT(KCOB also) has better reliability;

3. CRI (Ra): Color rendering index. Higher the CRI, the higher the ability to show the true color of goods. Outdoor CRI requirement is mainly 60~75ra(LED). Indoor applications may have higher CRI standards. (80~90ra).
4. LED Lifespan: For LED products(SMD/COB), the Lifespan is 50,000 hrs (around 5 years) in theory. The light decay would be around 30%. (while KCOB is less than 10%)
5. LM80 Test: A standard lumen intensity test for the luminaire. LM80 test of KCOB luminaire is in processing in BACL institute. Now 6,000 hrs, mainly no light decay.
6. LM79 is a similar test standard for the whole lamp. illuminance/LUX(/lx): The brightness of the object under the lamp. We always talked about the LUX on the ground.
7. Light distribution: light distribution is decided by the optical lens. It could be measured by integrating sphere. We could get IES files by this test.

KCOB VS traditional lamp (HPS)

HPS is short for “high pressure sodium” lamp. Most popular species for streetlight before LED;

The CCT of the HPS lamp is 2200K or lower and it could not be changed. So HPS has the strongest ability going through fog&smoke;

Name KCOB streetlight HPS lamp
Lighting-up time Instantly 5~10 minutes(Every time)
CRI 70~75ra 20ra
CCT 2200K~6500k 2200k
Lumen efficacy 110~130lm/w 40~60 lm/w
Lifespan 80,000hrs (20~30% decay but lighting) 15,000 hrs(Start decay in 2,000hrs)
Environmental pollution No Yes

KCOB VS traditional lamp(MHI)

MHI is short for “Metal halide lamp”. Update luminaire after HPS. Mainly for streetlight, floodlight, Sportlight ect.(Golf resort)

Efficiency 110~130lm/w 70~100lm/w
CRI 70~75ra 65ra
Lighting-up time/currency Instantly 5~10 minutes(Every time)
UV No Yes, around 34%
Glare/Flicker No Both are extremely serious
Lifespan 80,000hrs(30% decay) 8,000~12,000 (Dead)
Enviromental pollution No Yes
Smart system available available


Light distribution:

The SMD board is big&wide, so as the lamp(If more than 300w, the size would be like a table). And when in need of a narrow beam angle(Small than 90°), SMD could barely make it.


SMD has many chips on the board. So in order to make light distribution, it needs many lenses to match with, Plus, they are different from each other. So it has two problems: Raw material: In order to cost down, 99% suppliers use PC lens which is bad for light transparent&heat sink. Assembly accuracy: the lens board is too big, if little tolerance when assembling, the whole light distribution is messed up.


The biggest advantage of SMD is the big flat PCB for heat sink. But when it comes to big wattage, the attaching part between SMD board&lamp would be not that well due to the uneven surface. At the same time, K-COB product has better reliability. 2700K is the lowest CCT for regular LED. While KCOB could be 2200k,110lm/w, exactly the same as HPS.



1.Maximum wattage for COB is 150W and it's extremely unstable, while KCOB could be more than 1000w;

2. The size of KCOB is at least 15% smaller than the normal COB. Easy for the light distribution design.

3. 2700K is the lowest CCT for regular LED. While KCOB could be 2200k,110lm/w, exactly the same as HPS.

4. Totally different standard for reliability. KCOB is the first-ever light source supplier that applies the BACL LM-80 test for 600w light source.

47mm KCOB



Post time: Dec-28-2021
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