Incandescent Filaments

The house is energy inefficient. There are gaps and gapes and draughts where the cold air sneaks in passing the warm currents on their way out.

A man - expert in these things - came round and kindly offered us his advice.

He fitted balloons up the disused chimneys, told us how we could use less energy and save some money, removed the pretty but energy hungry globes with the delicate filaments that emit spectrums of brightness and atmosphere and warmth.  Then handed us a free power usage monitor.

from here