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I had a regular one and a 3ft tall one. The big one had a 100watt bulb in the base if I remember correctly. The only thing was that the base gets hot, so I put it on a stepping stone brick instead of directly on the carpet. If it's on a desk, my sister used a ceramic tile style pot holder under a smaller sized one. Otherwise just the "don't touch" type warnings, but really the glass is only warm.
I loved it! The big one made the whole room glow, but it was a gentle light you could sleep with it on if you wanted to. I would leave it on when my sister would come to bed after me, that way she didn't have to turn a light on and wake me up.
They take a bit of time to warm up and get the motion going, and then if they get too warm the motion doesn't work anymore (all the lava stays at the top) but that's just the nature of the beast. It's the hot/cold interaction that makes the lava move, and once it's all too warm (if you leave the lamp on all day, for example) then it doesn't move much anymore.