Earlier quoted context omitted.
the hue bulbs use zigbee, so way less than, say, wifi, but it looks like about .4W/bulb/day 2.8W for the starter kit (base has to be on as well) http://greenmonk.net/2014/02/20/internet-things-connected-ph...
Watts already express energy over time, so the /day is redundant. The article you linked to gives a good comparison: > [three bulbs + bridge] is the equivalent of leaving a 60W bulb on for a little over an hour and seven minutes per day
But, you're right, i should have used better units, and the x/y/z is right but confusing. your quote from the article is the right way to explain it.