Should be fine, alhtough it'll really depend on what else you're going to do for the plants? I.e. you gonna add CO2, ferts, etc, if not then the 1.5WPG that tube will give you should be ok for undemanding plants like java fern.
You are prbably going to need more light if you start adding CO2, ferts and want to keep plants like glosso.
Hope this helps
Sam