New 5.5 gallon: which lighting fixture?

Hi all.

I'm putting together a 5.5 to replace a 1 gallon low-light setup that I retired. And am still beating my head against the wall about lighting this thing.

So far, tank vitals are:

5.5 gal
AC 150 (will upgrade to either a ZooMed 501 or Tom's mini cannister)
25w heater
Eco-Complete substrate
Tom's 13w "Perch Light" 6700k
assorted crypts, Anubius Barteri, Java Fern, Java Moss
DIY CO2, ceramic diffuser

I want to move from low-light into medium-light plants, nothing too crazy like Glosso or anything. I've not settled on what yet. I'm looking at having something like 26w of lighting total.

I also want to mount the lighting on the underside of a bookshelf that will be above the tank. Options so far are:

AHS 2x13w retro kit
2 Tom's Perch lights modded to be hung under the bookshelf
Something I didn't think of

I lean towards the Tom's because I already have one of them, and it seems like it would be very easy to mod them to hang like that. Giving me 2x18w 6700k on 5.5 gallons.

So I'm hoping for input on whether I'm crazy to use these perch lights like this, and if my lighting estimate of 26w will work.

I'll post pics when the setup is more finalized.