Not to be confused with COB technology (blue/UV LED chips directly bonded to the board rather than the usual plastic or ceramic package and poured over with protective and phosphorous resin, usually used for high power density thanks to better heat dissipation):
Technically, filament bulbs are also COB (the filaments are tiny PCBs, rigid or flexible):
Annoyingly, they are also called “cob lights”.
Not to be confused with COB technology (blue/UV LED chips directly bonded to the board rather than the usual plastic or ceramic package and poured over with protective and phosphorous resin, usually used for high power density thanks to better heat dissipation):
Technically, filament bulbs are also COB (the filaments are tiny PCBs, rigid or flexible):
Also, some bulbs are both cob and COB:
