if its a phone app, be careful they are very unreliable. that should have been less than 300 par basically at the top. that usually a good starting point depending on the depth of the tank..Will do I know when I measured at the surface with the light 8 inches above it was about 20,000 lux I'll have to measure at the bottom as well, I've turned it way down since then, it was at 80 blue and 10 white at that time
You can also meter the the light dry if its easy to move or just point away from the tank.
Glad your using a meter. at a 1:1 divide by 60, more blue should be a higher number like 65 to 70. it depends on how broad a spectrum. the blue channel is. narrow is higher.


