The lightbulb revolution has just begun

Lately, there’s been a lot of heat over the simple lightbulb. Over the past decade, manufacturers raced to make their lightbulbs more efficient. The competition helped people save both energy and money — and the environment got a pretty big boost, too. But not everyone’s a fan of all that innovation.

A more efficient bulb “doesn’t make you look as good,” President Donald Trump has argued multiple times over the past year. “Being a vain person, that’s very important to me,” he joked at the White House in December. Vanity aside, his position is that consumers ought to be able to purchase whatever kind of lightbulb they want, even if it’s one that uses a lot of energy.

Old-school incandescent lightbulbs, which waste a ton of energy, were...

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