Derasas and squamosas require the least light and would probably do well under PCs with enough wattage. However, they get the biggest and are the least colourful.
Maximas and croceas are the most colourful and desired, but require the most wattage. I've seen a few people keep them high up in the tank under PCs, but there's a difference between merely keeping one alive and having it thrive over the long term.
I think it would be very challenging keeping a crocea clam thriving with its beautiful colours under PCs or VHOs only no matter how much supplemental feeding you give it.
Be that as it may, I'm going to try a maxima under my 4x39W HO T5s. I've got a nice spot about 5 inches from the top staked out for it.