best nano lighting and how to retro

[ROGERWILCO357]

Ok I have one of those all in one nano tanks one is 12 gallon and the other 24 or so gallons they both have the pc lighting with canopy all built in and would love to keep it that way , I have cats so the lid is nice..anyway I would love to keep sps but I don't think i could get the proper lighting to fit under that built in canopy. have been out for a year or so and looking to get back in.So what lighting will work best for retro-fit? guess I will be keeping a pair of clowns or other small fish with zoanthids yes I think this nano will be my zoanthid tank so what lighting would you recommend led? I think I want to go with led's since they don't heat up just hope they put out enough light anyone here gone down this road?
any intel will be appreciated.
Roger