Yeah, whatever they can think of, they could also just state power consumption.
The funny thing is we are used to the latter being done for things like LED lightbulbs and even flashlights: A 5 watt led lightbulb is supposed to consume 5 watts of power. Sometimes they do, sometimes they don't, but what i'd be more interested in is the amount of light coming out of it.
Realistically we should be getting '1000 lumen' lightbulbs, and the lower the power consumption they have the better.
In the EU this actually has to be on retail packaging, both lumens, color temperature, electrical power, and an efficiency rating that is somewhere between A+++ (best led), A (first gen led, very good CFL), and F/G (tungsten, carbon filament etc).