What PAR reading is needed for Tridacna Clams??

[Chris Harbaugh]

I have a 125g. Standard tank with a 55g refugium. My water depth is 22inches to my sand bed. I currently have 3 Hydra 26 LED lights over my tank and am planning to add a 4th. My lights are 18inches above my tank. Is this suffecient for Tridacnid Clams of all kinds?? What PAR reading is needed for Giant Clams to thrive. I have read and read books and they all have different advice but most just wash around the subject and give no one answer.. any info on this would be greatly appreciated..

 

[saltyfilmfolks]

I believe the minimum is around 150 to 200 par. there is no maximum with proper acclimation.