This also leads to the issue that Android light meters might seem trustworthy due to acceptable results on a certain phone model in a certain scenario. Some seem to measure acceptably accurate within a given range whereas others are just dangerous to use for anything else but changing the screen brightness. When diving deeper into the usage of the ambient light sensor, it also becomes evident that its accuracy, precision, and directionality is highly dependent on the phone model that you are using. grow room), you'll get different measurements. This means that depending on the reflectivity of your surrounding area (e.g. High-quality light meters respond to light from different directions based on the cosine-law, which the ambient light sensor does not. For plants, we need to measure PPFD that resembles the PAR spectrum. Illuminance represents light as perceived by the human eye. The sensor is mainly used to dim the screen brightness according to the available ambient light, which does not require much accuracy at all.

However, using the ambient light sensor incorporates some issues: This seems great at first glance, as the ambient light sensor is directly delivering you the illuminance in lux that you can then use in your app.

The issue with all the light meter apps that we are aware of on the Android platform is the way they measure: All of them seem to use the built-in ambient light sensor that can easily be accessed by any software developer. There are light meter apps for Android – in fact, many of them.

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