Compare windowsills and corners using the same phone, at the same time of day.
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About this tool
How it works
Phone cameras are not calibrated lux meters. This tool reports relative brightness for comparison, not horticultural-grade lux or PPFD.
Example
Measure beside a window, then move to the proposed shelf and compare the relative reading.
Private by default
The calculation or transformation happens in this browser. There is no account, and the values you enter are not sent to NaughtyBear Labs.
How to use Plant Light
- Allow camera access and take a reference reading in the brightest candidate location.
- Measure other locations with the same phone, camera direction, and time of day.
- Compare relative readings alongside the plant’s known light preferences and seasonal changes.
Common questions
- Is this a real lux or PPFD meter?
- No. Phone cameras are not calibrated light meters; the app is for relative comparisons between locations.
- Why do readings change during the day?
- Sun angle, clouds, curtains, reflections, and automatic camera exposure all change the measured brightness.