Hi there
It is probably due to a few factors, first yes if your light is old you may want to consider a new light you should look for a light with 6000-8000K.
Some good options are the
nicrew light I have linked
https://www.amazon.co.uk/dp/B0899K89TC/?tag=
or you could try the
Fluval COB this is the light I use but it depends on tank size.
Another thing is nutrients in the photo I can't quite see the soil type but after time even the best soils run out of nutrients also due to the fact that the plant looks like a water column feeder it may be a nutrient issue. Try using a liquid fertiliser there are many good ones. I see you are in Hawaii I am from Europe and use Europe fertiliser brands so cant suggest one but I hear
aquarium co op easy green is good
hope this helps
ember04