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Problem page

How to check the light under a grow light

You hung a grow light above the plant shelf and now you are not sure whether the leaves on the edge get as much light as the ones in the middle. The light looks bright to you, but plants on the same shelf can grow very differently. A quick measurement at leaf level shows where the light really falls.

2 min readWritten from play.google.com✓ Approved by the founder · 4 Nov 2026
The short answer

WristLux is a light meter on your Wear OS watch, and plant placement and grow-light checks are among the uses it is built for. You open the plant mode and hold your wrist at leaf height under the lamp.

On this page
  1. Why the usual way fails
  2. How WristLux helps
  3. Step by step
  4. Tips
  5. Questions

Why the usual way fails

Grow lights are usually brightest straight below and fade toward the edges, and that fade is hard to see with the eye. Distance matters too. Raising or lowering a lamp a little changes how much reaches the plants, yet nothing on the lamp tells you that. Window light adds to it during the day and then disappears, so the same spot is different at noon and in the evening. Most plant owners end up moving pots around by trial and error and waiting weeks to see if it worked. By the time a plant looks stretched or pale, it has spent a long time in the wrong spot, and it is not always clear whether light, water or the season was to blame.

How WristLux helps

WristLux is a light meter on your Wear OS watch, and plant placement and grow-light checks are among the uses it is built for. You open the plant mode and hold your wrist at leaf height under the lamp. The live lux reading shows the light at that spot. Start a session and move your wrist slowly from the center of the shelf to the edge, and WristLux records the minimum, maximum and average along with the time you measured. That makes the difference between the middle and the edges visible. You can hold a reading to note it down while the live meter keeps running. Everything happens on the watch, with no account or phone. Readings are approximate and depend on wrist angle and shadows, so use them to compare spots rather than as exact values.

“Plant placement and grow-light checks”
From play.google.com
“Session min, max, average, and duration”
From play.google.com

Step by step

  1. Open WristLux and switch to the plant mode.
  2. Hold your wrist flat at leaf height under the center of the lamp.
  3. Note the live lux reading, or hold it.
  4. Move slowly to the edge of the shelf and watch the value drop.
  5. Check the session minimum and maximum.
  6. Move the plants that sit in the weakest spots, or adjust the lamp height.

Tips

  • Measure at the height of the leaves, not at the pot or the shelf. That is where the plant actually receives the light.
  • Do your checks at the same time of day, so window light does not mix into the comparison.
  • Put the latest reading on a watch face complication to compare quickly after you move a pot.
  • Keep the watch case and wrist angle the same for each spot, since both affect the reading.

Questions

Is there a mode for plants?

Yes. Plant is one of the modes, next to desk, reading, photo, outdoor and evening.

Source: play.google.com
Does it keep measuring when the app is closed?

No. The Tile and complication show the last saved reading and do not poll the sensor.

Source: play.google.com
How exact are the readings?

They are approximate and vary by watch model and how you hold your wrist.

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.