I’ve opened some of these before, but thought it would be good to see if there has been any progress in this area of LED lighting.
COB means Chip On Board and relates to the direct mounting of LED dice directly onto an aluminium core PCB and covering them with a clear or phosphor loaded gel.
The usual arrangement is to use half watt LEDs and arrange them as a series parallel array that allows them to match whatever driver is used. In this case it appears to be two series strings of three LEDs wired in parallel. When I tested it with the bench supply they started glowing at 7V and reached their full 300mA at 10V.
The little power supply was a common mini 3W switcher with a chip that I couldn’t actually identify online. But it looks like a typical minimalist switchmode chip with primary side sensing.
At first I was ompressed at the construction, and thought the COB LED array was being pressed down tightly onto the heatsink, but latterly I noticed that the reflector sits on a ledge and may not actually be pressing it down properly.
That said, it’s a very stylish lamp and its modular construction is quite pleasing.
The ebay listing for this is:-
