Or melt your hat to your head! True story...
Depending on the setup of the lamp. It should be fairly easy to use LED lamps inside these units when the halogen tube goes.
Yeh, stick with led's there's nothing worse than the smell of burning moths!
And they'll heat the room nicely ! On a serious note, the lamps don't last long and are becoming difficult to buy.
For the amount of time they'll be on I expect we're talking about a few pence more to run a halogen.