A Philips Hue lamp is a LED lamp that can be controlled wirelessly. It always draws power for its control circuitry, also when the LED is turned off.
I wondered how much power it consumes in the off state. Doing some research, I found a couple of forums where people asked the same question, and getting answers that is was very little, varying from 0,01 A to 0,02 A.
I got similar results for the current when I measured this:
But I wanted a more precise answer, and not only the current. I am more interested in the power (Watt) consumption. As our domestic electricity meters measure real power over a period of time.
Thus I measured the power consumption of a 1100 Lumen color Philips Hue lamp that I had switched of via the smartphone app over a period of 10 days.
And these are the numbers I got after 10 days:
0,07756 kWh over a period of 10 days, that’s 0,32316 W. Notice that the display indicates KWh, but that should be kWh (lowercase k for kilo).
Extrapolating to a whole year, that’s 2,831 kWh. Which in my case, correspond to a cost of €1,50 (roughly speaking) per lamp per year.
With online numbers claiming the current to be between 0,01 A and 0,02 A, at first I expected the power consumption to be higher. But the power factor is quite low (around 0,10), explaining a lower power consumption.
Update 2022/09/01: I redid the test for one day (24 hours) using a more precise powermeter (GPM 8310) and measured 8,9188 Wh for 24 hours, or 0,3713 W.
Didier Stevens 
I make it quick: Thanks for taking a deeper look into this 🙂
Comment by Marc Ruef (@mruef) — Sunday 3 April 2022 @ 17:33
Thank you for doing the bench work! I’ve looked everywhere. I’ve been tinkering with Home Assistant and figuring out what some of my “untracked consumption” may be in my Energy dashboard. It’s the Hue light bulbs!! I’m in the process of creating a Helper that keeps track of which bulbs are on or off, and calculates a rough power usage each day. Wish me luck.
Comment by Anonymous — Saturday 28 December 2024 @ 8:38
I was searching exactly for this answer and didn’t want to do the calculation myself.
Straightforward and direct blogpost ! Thank you very much
Comment by Anonymous — Saturday 15 March 2025 @ 17:40