we have used a broomstick with a light tied to it, balanced on something or other, if we weren't using our homemade pens - )which have hooks in the roof to hang the lamps).
just test the heat first incase it is too hot.
if you have a dog crate, then put the plastic box inside that and put a broomstick between the bars to hang the lamp off. iv always used a proper lamp with a metal safety cage thingy as im always scared it will catch fire if it falls.