The most info I can find on those lights is that they're for marine use, so I have no idea how to categorize them.
How long have the S. Repens been in your tank? How much have they grown since you planted them?
If that tall growth was achieved with that light, then I'd consider it a low-medium light. You could still theoretically achieve a carpet but it will take more patience and manual propagation. At least from what I've read about them. Mine have surprised me, but their growth is incredibly slow, even with ferts, CO2, and medium-highish light.
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