This two pack of solar lights is one of my favorites. They are inexpensive and are very bright. I installed them on the outside on an RV. I drove over there last night and the whole area was lit up. Pretty powerful for its size. Anyway.. These can be used on the outside or the inside. If you use them on the inside .. be sure to install them where the direct sun can charge them back up. What a great way to reduce your power bill. Or for those of you who are off grid... this is a fabulous option for you. For me.. I love having the lights on the RV. It makes things so much easier to be able to see and not need have the RV hooked up to the grid,.