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That should be the lower end of medium light on your depth of tank. You should be able to do low tech. I strongly suggest dosing some extra macro and micro ferts and look into daily dosing of liquid carbon such as Excel or Metricide 14. Your low tech tank plants will do even better. OS.
Unless you're just itching to buy a new fixture, you should try the ferts and liquid carbon with it first. It could be just right for a med. light tank. OS.