There are many places in the home that could use a little extra light. These areas include anywhere work is done; think about the places where you prepare food, do all that extra work that the boss shamed you into bringing home, or your workshop bench. A great solution for these situations is to install under-cabinet lighting. They also come in handy for the dark corners in the bathroom vanity under the sink. For these areas, it's more practical to use the battery operated ones.
These lights are inexpensive and easy to install with just a few common tools. Energy efficiency? They score very highly in this area, especially if you go with the latest LED lights.
Read this article on under-cabinet light installation. Then do a walk-through of the house to identify the spots that could use a bit more illumination. A shopping trip, a bit of DIY fun, and your work spaces will be glowing in short order!