I've used those Aquazonic LED lights before, but in a much smaller 20cm cube tank. It did manage to grow some anubia and mosses, but i haven't tested with carpet plants yet.
I guess glosso could grow under that light but the growth may be much slower due to the lower light intensity, especially in a 38cm length tank. Just have to try and see.
Just for reference and comparison, you can check out a 30cm low-tech tank by chansl which was able to grow a glosso carpet with an Up Aqua Z-Series Z-10 LED (10.7W) lightset:
http://www.aquaticquotient.com/forum...t-Planted-Tank
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