They are a bit big in circumference, so you need some space in the lamp. I use mine outside on the patio. It is not fully protected and gets wet when it rains. So far it still works perfectly. The light output I get is very good. I like the color/light shade it gives off, it's easy on the eye not harsh. I've only been using it for a few months so I don't have any durability ratings but if it lasts a few years I would buy it again.