How Much Electricity Does a Smart Bulb Use? (2026 Data)

A smart bulb stays powered even when the light is off. The WiFi, Zigbee, or Z-Wave radio inside needs continuous power to listen for the next voice command, app trigger, or scheduled scene. That idle draw ranges from 0.3 watts on budget models to 1 watt on full-spectrum color bulbs with built-in WiFi radios.

At a typical 0.5-watt standby, the bulb pulls 3.65 kWh per year just in listening time. That's 22 percent of the bulb's total annual energy at four hours of on-time per day. On a 1-watt standby bulb, the listening share climbs to 31 percent. The light itself isn't the whole cost. The connection is part of it.

The standby power guide covers how these small always-on draws add up across a house. Smart bulbs are one line item in a longer list that includes routers, game consoles, and anything else with a status LED.

All figures use the April 2026 US residential average of 18.05¢/kWh from the EIA Electric Power Monthly, assuming four hours of on-time and 20 hours of standby per day.

Wyze Bulb Color (8.5W on, 0.3W standby): $2.64 a year. The lowest standby draw in the consumer smart bulb market adds 40 cents a year in listening costs. Philips Hue White A19 (9W on, 0.5W standby): $3.03 a year. The RunWatts smart bulb calculator defaults to this 9W tier. LIFX Color A19 (11W on, 1.0W standby): $4.22 a year. Higher on-wattage for full-spectrum color plus a direct WiFi radio (no hub) that draws more at idle.

For comparison: a dumb 9W LED at the same four hours costs $2.37 a year because it draws zero when off. A 60-watt incandescent at the same hours costs $15.81. Even the highest-standby smart bulb saves 73 percent over the incandescent it replaced. The cheapest smart bulb saves 83 percent.

Single-bulb numbers are small enough to ignore. The whole-home numbers are worth seeing. A house with 20 Philips Hue bulbs at four hours of daily on-time each uses 335.8 kWh a year and costs $60.61. Of that, 73 kWh ($13.17) is pure standby. The same 20 sockets with dumb LEDs: 262.8 kWh, $47.44. The standby cost is $13.17 a year, about a dollar ten a month.

Those 20 sockets with 60-watt incandescents would cost $316 a year. Swapping incandescents for smart LEDs cuts the lighting bill by 81 percent even after the standby penalty.

For context, a single 15-watt wifi router running 24/7 costs $23.72 a year. One router costs almost twice as much as the combined standby of all 20 smart bulbs. The standby draw on smart lighting is real. It isn't large.

Smart bulbs cost more than dumb LEDs in standby. They also turn off lights that dumb LEDs can't. A bedtime automation that shuts off every light at 11 PM, a motion rule that kills the bathroom after five minutes, a vacation mode that runs on zero: these eliminate forgotten-on hours that dumb bulbs silently accumulate.

If schedules and automations eliminate one hour of forgotten-on time per day across 20 bulbs, that's 65.7 kWh saved, worth $11.86 a year. The standby penalty for those same 20 bulbs is $13.17. At one hour saved, the automation nearly pays for itself. Push that to an hour and a half and the automation pulls $4.62 ahead. Most households with smart lighting leave fewer lights burning overnight, which means the net cost of going smart is probably lower than keeping dumb LEDs and forgetting to flip the switch.

The LED vs incandescent yearly cost breakdown shows how much the wattage drop from 60W to 9W already saves. The standby layer on top of that is a rounding error on a rounding error.

A Philips Hue bulb at four hours on plus 20 hours of standby uses 16.79 kWh a year. The cost depends on the local rate:

Louisiana (12.44¢/kWh): $2.09. Texas (14.80¢/kWh): $2.49. US average (18.05¢/kWh): $3.03. New York (24.40¢/kWh): $4.10. California (31.01¢/kWh): $5.21. Hawaii (39.79¢/kWh): $6.68.

Hawaii costs 3.2 times Louisiana for the same bulb. Twenty smart bulbs in Hawaii cost $133.60 a year total, about $29 of it in standby. That's the most expensive scenario for smart lighting in the US and it's $11 a month. The state rates guide has the full 2026 breakdown.

1. Pick low-standby models.Wyze at 0.3W vs LIFX at 1.0W saves 92 cents per bulb per year in standby alone. Across 20 bulbs that's $18 a year, more than the total standby cost of 20 low-standby bulbs.

2. Use schedules.The payback on smart lighting isn't the bulb itself. It's the automation. Set a bedtime scene, a motion timeout, an away mode. Every hour of avoided forgotten-on time across 20 bulbs saves about 3 cents a day, which adds up across a year.

3. Dim in the evening.Smart bulbs at 50 percent brightness draw roughly half the watts. Dimming to 50 percent for the last two hours of a four-hour evening saves about 3.3 kWh per bulb per year, 60 cents each. Across 20 sockets that's $12 a year for adjusting one automation.

4. Leave the wall switch on. Turning a smart bulb off at the wall draws zero watts but kills every smart feature. When someone flips it back on, the reconnection handshake draws more than continuous standby over the same period would have. Control smart bulbs through the app or voice instead.

The smart bulb calculator lets you plug in your bulb count, daily hours, and state rate to see the total. The lamp electricity cost guide covers the fixtures these bulbs sit in, and the standby power roundup shows where smart bulbs land relative to every other always-on device in the house.