We know you've heard plenty enough about CFL bulbs and their positive impact on energy use. But did you know there is an alternative already out on the market that are dimmable, can be used outside, last longer (rated for 18,000-25,000 hours), and turn on and off instantly? Cold cathode bulbs might be a worthy option for those who've held out for the factors noted above and come in a spectrum of wattage and lumens. Available at 1000Bulbs.com. And yes, these still contain a little bit of mercury like their CFL cousins.