Tank is newly start up with new soil and plants. When the leaves of some aquarium plants start to turn a bit transparent and loose some of it's green (ie turn a bit faded green or brownish), does it mean not enough light?

I have a DIY LED lighting using 120 pcs Epistar 5050 LED (total lumen supposed to be approx at least 1650+) which seems quite bright to me. They are on 12hrs per day.