I am trying to figure out more about this. Do you happen to know:
On this page: Amazon.com
They say “Product Dimensions 6.69 x 5.12 x 0.39 inches” but when I look at the video it looks much smaller, so maybe “cm” is correct instead of “inches”?
I know only what see. I do see they list the dim’s you cite but, they also post this image that contains the dims on the COB
Thank you. It is consistently inconsistent! I am voting for the dimension drawing you just posted, but this is a poster child for the reliability of product information on Amazon… 
One thing I am somewhat inferring: These modules such as the Chanzon SEEM to require more heatsinking than the rings such as
or disks. I wonder whether the compact module has higher thermal resistance junction-case than good individual LEDs do, so needs more heatsink. I sort of like that ring but it includes a wide AC range driver. I would need to discard the driver in order to power it from DC and make it dimmable. That sort of puts me back at making my own disk of LEDs. Use as much copper as possible on a 2 sided board for cooling. I can fit a disk that is 28 - 30 cm in diameter.
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