There was a time when light bulbs were pretty much all the same. You’d choose a certain wattage– the higher the number, the brighter the light–maybe you’d splash out for a three-way bulb, and then you’d be on your way. But lighting technology is advancing rapidly, and now we have many more choices. Understanding the specifications of the newer types of bulbs, including halogen, LEDs and CFLs will help you find the right light bulb for your needs.
In just 40 seconds, this video will explain color temperature in light bulbs, including the color rendering index (or CRI), and the difference, say, between a bulb that’s rated a 2700 kelvins and 5000 kelvins. (It’s a matter of how natural you want your light, and how warm or cool.)