Many options available to convert older forms of lighting to energy saving light bulbs the most common is replacing incandescent or halogen down light s to LED. LED lighting can be up to 90% more efficient and also converting to compact florescent (CFL) is a cheaper option also being very efficient than convent ail lighting.
I can source many types of products and have access to a LED lighting specialist www.ledecolighting.com.au. If special requirements are needed. To compare LED lights try www.ledbenchmark.com
LED Lighting:
Compact Fluorescent Lighting:
LED & Tube Options: