To take the measurement, follow the instructions for your chosen measurement tool carefully. For quantum meters and light meters, this typically involves turning on the device and holding it close to the measurement area. The device will display the PPFD measurement in units of micromoles per square meter per second (μmol/m²/s). If you are using a smartphone app to measure PPFD, the process will vary depending on the specific app. Once the measurement is taken, it is important to record the result and any relevant details for future reference. To get an accurate average PPFD measurement for a specific area, it is important to take multiple measurements at different points within the measurement area.