Difference between SMD LED and COB LED?
The newest COB LED technology, differs from traditional SMD LED Chips because instead of individual chips soldered to flexible PCB and then mounted to an aluminium profile; the Light-emitting wafers are cut into hundreds of smaller chips. These tiny small and hardly visible pieces of semiconductor crystal are bonded directly to the circuit board with a special bonding method allowing solderless fabrication and maximum heat dissipation. Beam angle up to 180°.
The yellow coating in the middle of the COB Chip is simply a phosphor coating, enabling complete control of color temperatures and CRI. This type of LED technology makes chip densities up to 840 chips per meter possible and promises to offer much more flexibility and better brightness over other LED technologies.
The COB LED achieves higher brightness with a more uniform appearance than its predecessors. COB technology offers increased levels of light dispersion banishing those dark then bright patches created by narrow beam fittings, It does not need to be installed in the aluminium channel and remove light spot by the PMMA diffuser. Furthermore, the COB has greater reliability and a longer life span than the SMD LEDs, with 3M adhesive tape on the backside, High colour efficiency, uniform illumination.
The advantages of the COB led strip are high efficiency, high density, high CRI, high flexibility, high beam angle, low power, no spot, long life, it will become the most important product in LED low-voltage lighting market in the future.
we sell 12 color types(2700K, 3000K, 4000K, 6000K, red, green, blue, yellow, CCT, RGB, RGBW and addressable RGB) and multiple width options. It is dotless, no spot, very good for home led linear light, led aluminium profile using. DC5V, DC12V and DC24V versions optional.
COB Flexible led strip light specification 
What you need to know about led strip installation:
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