Led powered lights is the obvious choice when you change the bulbs when consumption is significantly less.
A 1 - 2 WATT led powered lights corresponds to approximately 15 - 20watts standard light bulb ...
A 3 - 4 Watts led powered lights equivalent to about 40Watts standard light bulb ...
A 5 - 6 Watts led powered lights equivalent to about 60Watts standard light bulb ...

Led powered lights is more expensive than ordinary light bulbs, but through the energy savings you make and that they have a lifespan of 20-30 times longer than ordinary light bulbs is that investment is easy to recoup.