You mean on the phone screen? I'm not relying on the app I am relying on my corals to guide me for light intensity but if you google search par for radions you can find people with the same lights and same size tanks but completely different par numbers which creates confusion obviously. For the longest time I thought my intensity was perfect but now as I slowly raise the intensity it's like the corals are thanking me by growing more.If you set several layers of waterproofing, you'll get a number that deviates a lot