I have several Christmas lights with different AC adapters.
In the label of one of them, I read:
Primary: 220-240 V ~ 50/60 Hz Secondary: 31 V DC 3.6 W
In the label of the cable connecting this AC adapter to the LED array:
Lamp: 3.2 V 0.064 W 80 LED
I can not understand if this is referred to the single LEDs, but the total amount of LED seems to be
How are they connected, then?
In the case of a series connection, each of them would have a
0.3875 V voltage drop, which maybe is too small for a LED. If they were parallel,
31 V seems too much for each of them, and the total available current
3.6 W / 31 V = 0.1161 would be
0.00145 per LED. So, neither of these solutions seems correct.
In another LED string, I have a
4.5 V battery power supply, with no labels and therefore no indication about the current and the number of LEDs. Do they have a parallel connection?