Maxima clams - especially 'brighter, vibrant' ones require the most light out the most commonly found varieties: Maxima, Squamosa, Derasa. I think you have more than enough lighting. In fact; I'd be a little concerned if it was introduced directly underneath the LED fixture.
If it appears "happy" then I wouldn't change a thing. Like most corals (especially under LED lit displays); I would start the clam along the periphery and move the clam inwards and upwards (if necessary) to your desired location.
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