Like me, you’ve probably been replacing incandescent light bulbs with compact fluorescents to save energy.   You can tweak that choice a bit by choosing bulbs marked “daylight,” which have a higher “K” value that is closer to natural sunlight.   Eco friendly daylight compact fluorescent light bulbs show colors more accurately and boost mood by triggering serotonin, a chemical that fights depression.  I found them in wattages from 9 to 23 (equivalent 25-100) at Home Depot, where you can also dispose of them later in special recycling bins.  Dimmable versions are found on many internet sites.