it's not about the amount of par....your light has enough par for sure.
It's about the amount of par and the spectrum your new clam is used to and how much different your lights par and spectrum are in comparison.
if you've already kept a clam for 2 or 3 years, you know your light can cut it for them.
Honestly, if Aquattro doesn't feel that your pic indicates a gapping mantle, you should probably just keep a close eye on it and let it do it's thing...
To me, that pic looks like it COULD be gapping, but it's not obviously unhappy or gapping for sure.
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