It matters how big your tank is. But take a look at this video if you want more info on bars
Maybe irrelevant. But I have to chime in. Whoever was saying you are going to peak in the low 300’s at “half way up the tank” with a reef breeders photon must have a 60” deep tank. Because a single photon 14” off the water of my 24” deep tank with all channels set to max puts like 700+ par at the mid way point in the tank. For my 60”x24”x24” I have to run my two photons at 50% blues and 25% white/red/green to achieve 300-400 par mid way up the tank and 200 or so on the sandbed