Lighting switch requires a change in mind-set

A look inside the Florida factory of LED bulb manufacturer Lighting Science Group, the sort of innovative, "green" company that many would like to keep in the U.S.
Washington Post Staff Writer
Sunday, January 30, 2011; 6:29 PM

America, prepare to embrace "lumens."

For more than a century, buying light bulbs has been a fairly straightforward transaction: consumers have judged pear-shaped incandescent bulbs by how much wattage, or power, they consume.

But the government wants the next generation of bulbs to be measured by their brightness. And that means lumens.

In a nation with 4.4 billion light sockets, it's a tall order.

"It's a big deal, and it's going to take a while for customers to get used to the difference," said Jorge Fernandez, who buys light bulbs for Home Depot. "It's going to take people years to get accustomed to it."

Consider it akin to trying to switch to the metric system, but on a smaller scale.

The Federal Trade Commission is proposing that labels for all light bulbs put brightness - measured in lumens - at the top, with watts below under "energy used." (Although lumens have been included on light bulb packaging since 1994, few have noticed the tiny print.) The labels would also identify the bulb's estimated annual energy cost, its life and how warm or cool its light is.

The idea is to help people pick light bulbs that have the amount of brightness they need and to move away from thinking about watts, because manufacturers are going to be making more efficient, lower-watt bulbs.

The labels - which were set to appear in June but will probably be delayed six months at the request of the lighting industry - will apply to conventional incandescent, compact fluorescents, halogen and light-emitting diode bulbs.

Lumens will not be as clean a number as watts, though, because even among bulbs with the same number of watts, brightness will vary. A 60-watt bulb is about 800 lumens, but because the brightness of a bulb varies depending on the manufacturer, customers may see a lumen estimate of as low as 750 or as high as 1049 on the the new boxes.

Watts will no longer reflect the traditional lighting strength of the bulb. On Jan. 1 , 2012, manufacturers will have to produce the equivalent of a 100-watt bulb using 72 watts of power; a year later, they will have to replace 75-watt bulbs with ones that are 28 percent more efficient; by Jan. 1, 2014, they will have to do the same with 60-watt and 45-watt bulbs.

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