If you live somewhere that’s always sunny – make sure you do it on a sunny day, and vice versa.
We recommend doing this on an ‘average’ day for your location in terms of cloud cover. Step 2 – Check The Weather ForecastĬheck the weather forecast in your area. We use one called ‘Light Meter’ for iPhone (there is both a ‘lite’ and a paid version), but there are many others so don’t worry if you can’t find this exact app. Step 1 – Download A FREE Light Metering App To understand the ‘theory’ behind this exercise, and for an explanation of DLI we recommend you take a look at ‘ Grow Lights For Indoor Plants – How To Measure It, and Understanding Watts, PPF, PPFD and DLI’. In addition, cloud cover and seasonality have a huge impact on the availability of natural light.
The light you get in the morning is not the same as in the afternoon. The problem with it is that it can be inconsistent.
It’s free, and it’s incredibly high quality. Now, the best source of light you’re ever going to get for growing plants is natural light.
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