But unlike SMD, COB LED lights can’t be used to create colour changing bulbs or lights. This is because there are only 2 contacts and 1 circuit. Multiple channels for adjustment are required to create the colour changing effect. Because of this, COB LED lights are efficient in single-color applications, but not in more versatile technology.COB chips typically have 9 or more diodes. COB chips also only have 1 circuit and 2 contacts, regardless of the number of the diodes. This simple circuit design is the reason for the panel-like appearance of COB LED light (SMD light, on the other hand, appears like a collection of smaller lights).
Another aspect of the COB vs SMD LED Lights difference is in the use of energy. COB is known for better lumen-per-watt ratios and heat efficiency. This has a lot to do with the design of COB LEDs, and the cooling ceramic substrate of the chips.
Before, heavy duty technology like spot lights and flood lights made with LED were non-standard, because you’d need multiple LED sources to produce that kind of high lumen output.
But now, COB chips can produce a large amount of lumens with less energy. You can find it in all kinds of bulbs and applications, such as the flash of your mobile phone or point-and-shoot camera. Its range is higher with a minimum of 80 lumens per watt.