Finding the right LED can be challenging but definitely worth the effort, particularly if you camp without hookups often. A few years back someone on the forum had a great write-up and I used the very same panel LEDs from Ebay. Four years later they are working great with zero failures and adhesive still keeping them in place, even the exterior LEDs are holding up fine.
After our LED conversion we only use one side of our dual side overhead lamps since a single LED panel provides the same illumination as 2 incandescents. Our Iota converter outputs 14.8vdc which has posed no issues and panels run in the mid-ninety degree range. Since we primarily camp off the grid installing LEDs felt like we had added another battery. One of my favorite mods.