Last week, I wrote about the wisdom of buying stocks hitting new highs, recommending both Perrigo (PRGO), the largest U.S. maker of store-brand over-the-counter drugs, and EV3 Inc. (EVVV), which calls itself “Your endovascular company.” Both had a good week, and I still like them long-term. But today my thoughts turn to light bulbs. Of course, they’re not all bulbs anymore, but we’ll probably keep calling them that, just as we still “dial” and “hang up” the telephone. This weekend I was changing a bulb at home; I replaced a traditional 60-watt incandescent bulb in a ceiling dome with...