COB is the logogram of Chips-On-Board , It is a latest technology of led package these years. It is Multi LED chips (0.2W or 0.5W or 1W) are packaged together as one lighting board. The material of lighting board can be aluminum or copper or Ceramic. Auroras Lighting has been using SAA approved led down light with Ceramic COB LED
The Aluminum Board is the first generation of COB led,
The Copper COB LED:
It is always packed by 1W LED chips .Now it is widely used for various of high power led lights, like led flood light, led high bay light etc, the power is always more than 20W or 30W minimum
Ceramic COB LED
It is latest technology is Ceramic COB led. It is packed by 0.2W chips. 5pcs chips per watts. The power normally less than 50W, The biggest advantage of of ceramic cob is high CRI and high lumens. On average ,the CRI is over than 83. And lumens is more than 110lm/W, Ceramic COB led is widely used for led down light, led spot light etc for indoor lighting.
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.
Auroras Lighting uses 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.
What is the advantage of COB?
1, COB LED is less thermal resistance
Among different LED components such as high power LED, SMD, dip etc, COB LED is best in less thermal resistance and cooling.
1), High power LED package (ab.HP)
Total Thermal resistance (Rth-total) for high power LED is total of LED attach, Slug, Epoxy and PCB.
Rth-total = Rth-1 + Rth-2 + Rth-3 + Rth-4 2), COB LED package
Total Thermal resistance for COB LED is total of LED attach and PCB, no Slug, Epoxy. Rth-total = Rth-1 + Rth-4
COB LED is less thermal resistance.
The heat generated from LED chips can quickly and mostly conduct outside, which promote LED reliability and lifespan.
3), Comparation of thermal resistance
2, COB LED is better lighting effect
3. Application of COB Technology
1, COB LED light sources
2, LED lighting fixture which use COB LED light source