A few months ago I purchased a bunch of those led panels to replace the bulbs in our 17z. The ones I got were very bright but the wrong color. They made the camper look like an operating room. I was a bit gun shy to purchase a different set of LED's until a friend gave me one from a bunch he just ordered. They look great! They produce pretty much the same amount of light AND are basically the same color.
We have a 28DSBH so we've got the bunk beds in the back of the TT. Each bunk has a single bulb fixture so I put the new LED panel in one of them and then turned both fixtures on.
The only way you could tell which bunk had the LED panel was by looking at the fixture itself. I was impressed. So impressed was I that I actually purchased 40 panels to replace the bulbs in both trailers we have. We don't do a lot of dry camping but this summer both trailers will be dry camping for at least 2 weeks. With a bunch of kids around, the last thing you want is for them to drain the batteries down because they left a bunk light on.
Here's the link.