Sounds like you are doing fine with the setup you currently have. More lighting generally means more problems.
Lean kno3?More light does not always lead to problems if you have a stable tank, and if you adjust your fert and CO2 levels accordingly. More light over your tank, along with lean KNO3 dosing, can bring out incredible colors in a lot of plants if you know what you're doing.
But back to the OP's question-- what are your reasons for wanting to up your lighting?
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