Unsure about lighting for 18x18x36

I’m currently upgrading my crested geckos enclosure to a 18x18x36 bioactive. I currently have him in a 20 gallon long converted vertically. I did a bioactive setup for that one, but everything except one bromeliad has died off and I’m sure it’s because of lighting.

So I’m researching lighting for this one and just want opinions on the options I’ve come up with. I’m kinda leaning toward a panel from spectral designs that I saw recommended in here awhile ago, since it has uvb integrated right into it. My question though is about the diode chip. It comes standard with 20w, but is available in 30 and 50w as well. With a 36 inch height, should I spring for a larger watt size?

The other option I’m looking at is a jungle dawn spotlight. Would one suffice for this size enclosure? I know a lot has to do with plant selection, but I’m just looking for generalities at the moment.

Budget isn’t a huge concern, but 400 dollar lights like the Jungle Hobbies led aren’t a reality at the moment unfortunately haha

Sorry for the long post, I just want to get this right