Whilst Tribalbrit is classically correct, the watts per gallon (wpg) rule is very outdated and applies specifically to T12 bulbs with average reflectors.
With your tank, more important to ask is what is your budget, do you want high or low tech (high = loads of light, CO2, ferts added, low = less lighting, no additional CO2/ferts), finally, what kind of plants are you looking for? tall stem plants? Big leaves, small leaves? Short carpet? something to attach to hardscape? these are all questions that will help generate a decent answer. Also, what is the current stocking? certain plants will get eaten by certain fish, some will get uprooted etc etc.
Finally, budget. the more hightech, the more expensive. So some idea of budget may allow people to rule out certain ideas.
I would say though that with that depth, you will need to be looking at PAR readings quite closely, (PAR = Photosynthetically Active Radiation) PAR tends to drop off quite rapidly through water due to particulates and just general absorbance.
So, sorry for asking you questions rather than answering, but I think this will be the best way. Also, picture of the current set up please? May throw up a few ideas from the pros
Off topic: you are going to have problems with those plans, they're no good for the fish and the tank is not big enough for some of the fish.
What makes you say that? It's only 4' long and 18" wide - forget about the height/total volume - thats a lot of large active and/or territorial fish.
Common plec easily gets the same width of that tank and is very messy + potentially territorial, pictus very active shoaling catfish that will grow over 6", bumblebees shy and reclusive and the raphaels unfussy but still a decent size, clumsy and ossibly territorial with hiding spaces. Then already planning more fish on top of that?
Forget about a nice planted scape with all those big clumsy catfish messing everything up- stick to Anubias, Java fern etc on rocks/wood/ornaments. Those are low-light plants, your current light will be fine.
If you still intend on this stocking, don't waste any money on lights! Any extra light on the tank will just contribute to algae, and the fish you have listed prefer dim lighting anyway. Spend it on a massive filter or two...or three lol. A Fluval FX5's would be good to start with, but plan on adding more as the fish grow.
Never underestimate how much a large and healthy catfish will poop...
Personally, I would just re-think the stocking.
edit: Just saw the red tail shark in your tank! Yet another chunky 6" aggressively territorial fish species - limiting you even more.
No worries, I'm certainly not going to argue - its your tank to set-up how you wish!
. I hope with further research, you change your mind.
