heating large enclosures

[Matt]

This may have already been discussed (if so, sorry), but I was wondering how everyone heats large enclosures (for example melamine ones).

How do you feel about light bulbs that arent caged in. A little risky?
Its just hard to cage in a light bulb for a wirely little snake that can easily get through the holes of the wire caging anyways...any other suggestions??

let me know whatcha think

thanks