COB VS SMD

Just recently I was at a meeting.  I showed our products.   Among them were the COB LED light sources.  People were very curious about the light sources, possibly because most of them didn't even know what LED light sources looked like.

Here is a picture of our COB light sources:

They come in different shapes & sizes, depending on the watts.  All the LED dies are covered by a thin film.  By the way, COB stands for Chip-On-Board.  The yellow ones have color temperature in the range of 6000 - 6500 K whereas the orange ones have color temperature ~ 2700-3000 K.  I call the round ones cookies, the square cracker, and the strip ones bars.  Does that make you feel like having a bite?  ;-)

Here is a picture of the COB light source in the candle:

Here is a picture of a SMD (Surface Mount Device) light source in a light bulb:

You can see why with SMD light sources, it is better to have a frosted cover.  Esthetically, they are not that appealing if they are out in the open.