It's got to be set up properly in order for it to be accurate...DLI is to be set for how ever many hours your light will be on...So veg it would be 18/6...for flower would be 12/12...The type of led I think is blue and white...All the plants are not going to read the same...unless you take one light for one plant...Each light has a hot spot, which will be in the center of the light...I'm just trying to help Cake send you in the correct direction...