That's too much light.
Try something more manageable, like about 2w/gal, say a pair of 13W or a T5 24W etc.
There is no aquatic plant I know of that cannot be grown at 40micromols of light effectively and to a nice aquascaped degree.
In other words, if you want plants to grow well, look at nutrients(water column and the sediment) and CO2 gas enrichment.
Non CO2 methods also work:
No water changes for years, only top off, no test, not much work, feed fish, dose a little to the water column once every week, trim plants up once a month or thereabouts etc.
Pretty low key.
More involvement and more growth and more species selections can be had using CO2.
More light = more CO2 demand = more nutrient demand, so the work and dosing goes up correspondingly as soon as you add more light.
More light is
not better.
Figure out specifically what your goal is then you can select a specific management method to get there.
Regards,
Tom Barr