what is the best lighting for 50 gallon planted tank (size=36''*18''*18'')
The lighting section. Personally I would just start by reading every sticky on tpt. A google search with the planted tank and your seat criteria will bring up results to almost every question you can ask. Believe me, it's hard to find questions that havnt been asked before.
Personally I would say a quality t5ho fixture is nice. You're going to have a hard time growing those plants in a balanced low light environment high lighting is a must for those. With high lighting co2, is a must. With co2, extra fertilizing is required.
I would start off low tech (low light, noco2, less maintenance, etc.) , and some lower light plants
I have all those species, and just use 2-3 bulb t5 shop lights over 55g's and 75g's with phillips 6700k bulbs with no issues at all, except dwarf hair grass. Never could get it to work, but that may of been more fish related. No co2, very little ferts if any.