You've got plenty of lighting based on that. I'd say anywhere from 6-14 hours. I'm assuming that your actinics are probably on before and after your MHs, hence the wide number spread.

my actinics are on from 7am to 7pm
the mh right now are on timer 730 am to 430 pm
sound ok?

That sounds fine. Clams - especially bright maximas love the intense light. I would still start the clam off around the periphery before placing it directly under the metal halides. Slowly work your way inwards just like any new addition to your system.

Ok thanks:smile: