The LEDs wont damage anything. The converter charging at higher voltages may damage unregulated LEDs or so some have claimed. Many do not have that issue and the difference in cost can be ten fold.
There are a few threads that will help and in them you will find links to sellers that multiple people have used successful. You will also get the basic info needed to understand what you are looking for. LEDs come in every size, brightness and color so a bit of reading will make it easier.
this is my thread from when I converted with images and links from where others have gotten what works for them.
my threadThis is a larger, more complete thread
My LEDsFor us the difference in comfort and power usage is big. Before the LEDs we would barely use the lights and only where we needed. Now we light up the whole trailer with the four double fixtures on the ceiling with less power used than one incandescent bulb. They go on at dusk and off at midnight or so. In between we turn on and off the rest of the lights as needed and if I happen to leave the big porch light on overnight, it wont drain the battery.
You mentioned solar and extra battery and I have those too. Most of the time we don't need to conserve at all and that would be true even without LEDs. They sure did make a difference when the clouds came on a cold weekend and we needed the furnace day and night. We didn't need the generator but had we been using incandescent bulbs we would have.
