An Affordable LED Lightbulb
Only a few years ago, LED (or light-emitting diode) lightbulbs were prohibitively expensive for the average consumer. Even though some LED bulbs should be able to last decades while consuming much less energy than an incandescent or CFL lightbulb, many cost over $20 a bulb! Until now.
Philips just released a new LED lightbulb - a 2 pack for just under $5! They are selling like hotcakes and are backordered on Home Depot. These bulbs are 8.5-watt LED which is equivalent to a standard 60-watt incandescent bulb. They use 85% less energy than the old school incandescent bulbs. Incandescent bulbs aren't actually manufactured at all anymore.
CFL bulbs are still cheaper and much better than incandescents, but they do have mercury in them so if one breaks cleanup can be a big problem. You also cannot throw a CFL out with your regular trash.