Guide

How to compare light in two rooms with your watch

Choosing where to put a desk, a plant or a reading chair is easier when you can compare rooms with numbers instead of guesses. WristLux tracks a measuring session on your Wear OS watch, so you can compare two rooms in a few minutes.

1 min readWritten from play.google.com✓ Approved by the founder · 4 Nov 2026
On this page
  1. Step by step
  2. Questions

Step by step

  1. Open WristLux on your watch and choose the general mode.Screen: Mode selection
  2. Pick lux or foot-candles and keep the same unit for both rooms.Screen: Unit setting
  3. In the first room, start a session and move your wrist slowly around the spot you are considering.Screen: Live session with min, max and average
  4. Hold a reading when you find a typical value and note it.Screen: Held reading
  5. Go to the second room and repeat at the same height and wrist angle.Screen: Live lux reading
  6. Compare the averages and minimums of both sessions to choose the brighter spot.Screen: Session summary

Questions

Is it accurate enough to compare spots in my own home?

Yes, as a rough guide. Use the same watch and hold your wrist the same way for each spot, since angle and shadows change the number.

Source: play.google.com
Will the Tile drain my battery by measuring all day?

No. The Tile and complication do not keep polling the sensor in the background; they show the last reading the app saved.

Source: play.google.com
Can I use it to check a grow light?

Yes. Plant placement and grow-light checks are listed uses, and there is a plant mode. Treat the number as a rough guide.

Source: play.google.com
Will two different watches give the same number?

Not always. Readings depend on the watch model and where its sensor sits, so two watches can disagree in the same spot.

Source: play.google.com
Is there a watch face complication?

Yes. A complication on your watch face shows the latest reading you saved in the app.

Source: play.google.com
Does holding a reading stop the live meter?

No. The held number stays on screen while the live meter keeps measuring next to it.

Source: play.google.com

Reads live lux from your watch's light sensor so Wear OS owners can check desk, plant or photo light without pulling out a phone.