Could you elucidate on that? Why only have one plant in your enclosure, and why short term?
You
could get something smaller; Sansi also makes some excellent floods
https://www.sansiled.com/collections/led-grow-lights
(I wouldn't consider anything less than 24W—they won't have the power & range.)
but if you're thinking of upsizing, I'd go ahead and get equipment for the upsized enclosure; these lights are rated & warrantied for 5 years.