I have a led driver (LPC-20-700) that is 30V and 700mA, which makes it 21W.
I run 10 leds (≈ 2.8V drop) in series with it and it is an constant current device. If I plug my multimeter between, I do get the reading of 700mA.
When I use a little device (AC power consumption meter?) that checks the power consumption of devices I plug into DC, the reading tells me it's only 5.6W.
I can't wrap my head around what I'm missing here. Why are the numbers not equal?