Optimal sensor placement

A quick tip for positioning the sensor of your Spider Pharma Controller: Ideally, you should place it at the height of the top leaves—right at the top of your plants. What I like to do is attach the sensor to the grow light, keeping it about 40 to 50 cm away from the lamp, depending on the desired distance between the light and the plant tops. This way, you can easily keep track of whether your plants have grown and if the light distance is still appropriate.