The federal tax credit for electric vehicle purchases begins to phase out for an automaker once that automaker sells 200,000 electric vehicles. Once the phase out begins, the full tax credit ($7,500 for Tesla) is still available for the quarter they hit 200k in and the following quarter. After that it goes down to 50% for two quarters ($3,750), and finally 25% for two more quarters ($1,875).

Prices for LED light bulbs have dropped a lot over the last 3 years. Here is a simple guide to help you make the switch over to LED and learn how much you'll save. You'll also be able to determine how quickly the LED bulbs will pay for themselves, and where it doesn't make sense to switch yet.

Use this calculator to figure out how much wattage and money you can save by converting to LED light bulbs in your home.