SMD (Surface Mounted Diode) LED

COB (Chip On Board) LED

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 SMD LED Street Light

COB LED Street Light

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Low light intensity/ lumen efficiency

(50-60 lm per watt)

High light intensity/ lumen efficiency

(upto 120 lm per watt)

Nearly twice than SMD’s

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Are difficult to install & indulge high amount of labor & skilled man power in manufacturing luminaries.

Are easy to install & hassle free in nature, thus require less labor & man power in manufacturing luminaries.

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require high amount of maintenance

are almost maintenance free

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they can’t bear high junction temperature

they can bear high junction temperature

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The slightest of power fluctuations can blow up the SMD’s

COB’s don’t fuse easily & can survive major power fluctuations

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They get damaged easily & stop working

They work effectively even after rough handling

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SMD’s radiate more heat as compared to COB’s

COB’s radiate less heat as compared to SMD’s

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SMD’s are a very expensive source of lighting. Due to high amount of investment in labor & skilled manpower indulgence in manufacturing cost.

Compared to the SMD LED lights COB LED Lights are economic in nature. As they are easily manufactured, hence decrease manufacturing cost greatly.  (approximately 15-20% cheaper than SMD LED’s) 

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Are usually laid down in circuit, even a single fault in line diffuses all the following LED’s in the fixture.

COB technology does not requires a circuit. Thus, it is unaffected & totally safe from this defect unlike the SMD’s.

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Arenot very much reliable, the damaged SMD’s leave a spot or dead point in the whole layout fixture. Making it very awful to look.

Good reliability, the whole COB panel enlightens on receiving power thus no dead bulb and no spot caused unlike the SMD’s.

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SMD LED is fixed on small base PCB. Thus, radiates

more heat which could not dissipate further easily

increasing the junction temperature dangerously.

Thus reducing the luminous efficiency and life span of LED fixture.

COB LED Lights use flat base aluminum COB packing technology: COB LED is fixed on aluminum layer of

aluminum base PCB. The heat from chip is spread out

through aluminum layer rapidly. Thus enabling to

reduce LED Lights junction temperature, thus

increasing the luminous efficiency

and extend life.

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SMD’s emit unidirectional light in a single direction (in form of a straight beam) which makes them in-efficient for general lighting purposes as in flood lighting & street lights.

COB LED Lights emit out multi-directional light (i.e: uniform light in all directions) unlike the unidirectional lighting of SMD LED’s. Which make them more efficient than the SMD lighting fixtures, .

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Thermal resistances occurring in SMD’s

Proper thermal management in COB’s

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In SMD LED’s Without optimal thermo management, the following situations may occur-

Exceeding the permissible junction temperature

Decrease in optical performance

Shifting of wavelength

Changes in brightness and color

Destruction of an LED

Whereas, in COB LED’s without optimal thermal management, the following situations as occurring in SMD’s are suppressed.

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Straight & Strong irradiancy (not safe)

Equable and soft irradiancy (safe)

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Hard glaring and no eye Protection.

SMD LED Lights proved that led light source is too stimulating to the eye.

no glaring and proper eye Protection.

COB LED Lights effectively solved the problem that LED light source is not too stimulating to the eye, paving the road area to large-scale application for road lighting.

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Can’t handle jarring & bumping

Can handle jarring & bumping

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Highly affected by rain & storm

Not affected by rain & storm

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Generally IP 57 protection grading provided

Always above IP 65 protection grading provided