EARLY CFLS WERE ACTIVATED by intermittent signals that pulsed electricity 60 cycles per second, creating a hum and a subtle flicker that reportedly gave some consumers headaches. But newer CFLs, costing between $3 and $5 each, use a silent electronic mechanism that pulses 35,000 cycles a second, creating a steady glow that's more like that of an incandescent. Engineers have also found ways to liven up CFLs' sterile hue. While the phosphor coating on early models did a poor job of rendering color—giving off a cold, bluish light—many new models use an advanced phosphor substance to produce a look that's closer to old-fashioned bulbs.

In fact, the light produced by CFLs and incandescents is now nearly identical. Scientists measure light's color quality using two main factors: a Kelvin rating, which evaluates warmth, and a color rendering index (CRI), which indicates how light affects the appearance of color. The Kelvin rating for some of GE's compact fluorescents matches that of corresponding incandescents, and while their CRI is slightly lower, this is virtually undetectable to the untrained eye. "The industry has done focus groups on consumer acceptance of CFL color," says GE spokesperson Allison Ecklekamp. "It is very difficult to tell the difference between GE Energy Smart Bulbs and Soft White incandescent bulbs if you can't see the lamp." Russ Leslie, associate director at the independent Lighting Research Center at Rensselaer Polytechnic Institute, agrees. "Consumer resistance to CFLs is now mostly psychological," he says.

Though it's true that high-quality bulbs work and look better, cheaper models still on the market may use the old, sub-par technologies. How can you tell the difference? Look for Energy Star labeling—such lights use three-quarters less energy than standard incandescents—in boxes marked "soft white," "pink," or "daylight." You also need to shop carefully for brightness. Because fluorescents create at least three times more lumens per watt than an incandescent does, you'll find that a 15-watt CFL and a conventional 60-watt bulb are equally bright.

"The big hurdle for CFLs is getting consumers to select the right brand," says Riesenberg. "If customers have a bad experience early on, you're pretty much never going to get them back." Wal-Mart is now installing what it calls "lightbulb education centers" in all its U.S. stores. GE, meanwhile, has rebranded its CFLs, removing "fluorescent" from the labels to call them simply "energy smart." Why are GE and Wal-Mart investing in a low-priced, longer-life technology that, over time, will ultimately mean fewer sales? GE's leaders figure the technology is unstoppable—if they don't lead the market, someone else will. Andy Ruben, Wal-Mart's director of sustainability, is thinking along slightly different lines: "We see CFLs as the perfect starting point, the gateway that opens consumers up to the whole new frontier of sustainable products." Once Wal-Mart customers grasp the benefits of green products, Ruben reasons, they'll start buying organic cotton and produce, Energy Star washer-dryers, and other sustainable offerings that Wal-Mart is poised to sell.

Wal-Mart's outreach is just one of several recent campaigns designed to push CFL technology into the mainstream. Yahoo's 18 Seconds campaign—named for the time it usually takes to change a lightbulb—is seeding a CFL movement at a state level. OneBillionBulbs.com, a Web site launched last November by a Massachusetts software company, aims to convince the world to trade a billion incandescents for CFLs. The Coalition on the Environment and Jewish Life has taken up the cause, appealing to its constituents through a program titled "How Many Jews Does It Take to Change a Light Bulb?" Meanwhile, Australia's energy minister, Malcolm Turnbull, has announced plans to phase out inefficient lighting in his country by 2010. Officials in California are debating similar bulb-banning efforts.

The fluorescent trend has its predictable detractors. Conservative pundit Rush Limbaugh, for one, has used his talk-radio pulpit to rail against "wacko activists" pushing CFLs. But when you consider the benefits of widespread CFL adoption, a state-based or federal program to encourage it doesn't seem so crazy. If every American replaced one conventional bulb with a CFL, we'd keep 30 billion pounds of coal from being burned, and save more than $8 billion worth of energy. And that's without sacrificing performance or quality of light. It's the bright thing to do.