Oh boy, Ohms Law, Asian style..
It's no wonder that products from China, among other Asian countries have quality issues.
They cannot understand even basic electronic formulas.
"rough estimate" is hardly the professional way to go here.
Listed on a package is one product's specifications..of a replacement lamp.
"6 volt + 0.13 amps = 0.8 watts"
That's what it says.
Now OHMS LAW, the time-tested and accurate calculation states:
P=I x E *or* 6 volts at 0.13 amps = 0.78 watts.
Now mind you, the difference is a mere .02 watts off - BUT - is it SO hard to conform to stating accuracy and providing the Ohms Law figure?
This "rounding off" of electrical specifications surely isn't news, nor is inflated specifications, but if everything is so casually specified, it's no wonder there are issues.
If the mis-specification policy is widespread, cannot it also be a safety concern?
Just like lead in foods, tasty, yum.
They're not worried, they already got your money, you got their crap.
Pray for rain, you've got a better chance of satisfaction.