The first point to consider is that although home LED lighting will save you big bucks over time (in fact the break-even point is surprisingly short, often just 1 to 2 years), it is a long term investment. The initial capital costs associated with purchasing LED lamps are significant to most people, so it is prudent to schedule your conversion project into a number of separate phases.

Start by replacing lights that you use a lot (consume most electricity) and also replace those that don't need to be very bright. The reason for this latter suggestion is that older generation LED, although dated by the latest standards, are perfectly adequate as night lights and such like and can be left turned on all the time with negligible cost. They are also considerably cheaper than the modern generations of LEDs.

Those halogen spot lights mentioned above also make a good initial phase for your conversion project since they are typically installed in groups (on a rack of spots in a bathroom say, or as a dozen or more down lighters in larger rooms). They are also frequently left on a great deal of the time and are notorious for excess heat (for which read wasting electricity and money), so you will see clear and quick savings there. Cree LED spotlights are easily available and able to directly replace existing 35w halogen lamps, matching them closely for brightness, light color and beam angle, but saving 90% in terms of electricity running costs. Display lighting, again for the reasons noted above, make a good target for replacement. And should you not already have display lighting then look again at the aesthetic enhancements that low-power LED spots and lighting strips could bring to your home. Display cabinets, recesses, shelves and ornaments or other features in a room can in effect serve as additional and attractive sources of illumination.