Might be a weird place to ask this but someone suggested getting a Luxmeter app on my phone in order to make sure my AV's aren't getting too much light. Problem is, almost all the luxmeter apps I can find are $2 and I can't buy up a bunch of apps to try them all.

Right now I've got one called MQ Greenthumb, which is a luxmeter that supposedly will tell you what plants survive in footcandle readings. But I can't tell if the readings are accurate. It doesn't seem to pick up my grow light very well and it's only reading about 10fc in my room.... I dont now anything about light levels but that number seems absurdly low..

Anyone use an app that can suggest a reliable one?