Clams under 3" are generally only partially photosynthetic. Any of the larger clams that might do ok under that light would outgrow it in time and there is a good chance they won't thrive - if you do try it Hippopus hippopus, T. derasa or T. squamosa would be doable. Croceas or maximas would eventually incur a nutritional deficit under such lighting IMO and slowly starve.