I have some SMT LEDs that are marked with the cathode mark, but they clearly work the opposite of the markings, so I can only assume its a manufacturing error,
I have some of those as well. It could be however a data sheet error, or in fact another type of LED that is being passed off at that type number. That is the problem with China eBay components, you never know what you will get.
The data provided in the sale was insufficient, so i emailed the seller, and asked about the specific forward voltages. this was the reply:
"Dear customer Hello, very sorry, but I am now because of some things, in other cities, can not send you some data, you can consult the professionals"
it was clearly translated poorly. The diagram looked like zener diodes i think.
On 5050 SMT LEDs, does the triangle mark ever identify the anodes?
reversing one diode in a set of 3 diodes with common leads is almost like they were trying to charlieplex within the package.
Heres the schematic from my diodes.
It said the forward voltage was 2.9v-3.6v ?
The LEDs work fine, but the cathode mark identifies the anodes not the cathodes.