Electrical – How much power do LED smart bulb wireless control systems consume when the light is turned off

electricalledlighting

I've been shifting to LED light bulbs due to the energy savings but I've a question about the new smart bulbs that are controllable via Alexa etc.

These need to be kept "on" via the switch for them to respond to Alexa / Google etc. So what's the parasitic consumption and does it anywhere close to kill the energy savings advantage?

I mean say I use a smart LED bulb for 6 hours a day then during that time period the energy savings of LED kick in. But during the remaining 18 hours of the day when the light is in an "off" state but yet the smart bulb is essentially energized what is the power consumption? Somehow that does not seem to be reported anywhere. Is it negligible say compared to the 10 W LED "on" state consumption?

Any data?

Clarification: This isn't about being green for greens sake. If the power consumption is only a fraction of a Watt I've no interest in saving it. My question was mainly with the intention of figuring out whether it is a fraction of a Watt.

Best Answer

The specs are out there, just not always so easy to find. For example, one Philips Hue is rated at 9.5W with max. standby of 0.2W. (Click "The bulb" on the right side under Technical Specifications).

Using this bulb as an example, if it actually uses the full 0.2W all the time, 18H x 365D x 0.2W = 1,314 Wh per year. If your electricity costs 0.10/kWh, that's 13 cents per year for the 18 hours of standby vs. $2.08 for the 6 hours of light.