LED retrofit globes are available to fill almost every need. They are around ten times more efficient than common incandescent globes, and five times more than compact fluorescent lighting. Available in a variety of colour temperatures and in 240V and 12V.
An easy rule of thumb for telling the light ouput of an LED globe: take the last number away from the rated LUMEN (lm) output of the globe, e.g. 600lm = a 60W light bulb or 755lm = 75W light bulb. This isn't perfectly accurate, but is an easy way to get a rough idea