The Department of Energy (DOE) rules around lightbulbs have long been a lightning rod of sorts in American politics. Former president Barack Obama tried to phase out inefficient bulbs, but his successor Donald Trump scrapped the policy. The Biden Administration brought the plan back on track and, starting today (Aug. 1), the sale of energy inefficient lightbulbs will be banned in the US.

A new minimum standard for lightbulbs has been set at 45 lumens—or brightness—per watt. Retailers can’t sell bulbs that don’t meet the criteria, though households can continue using existing bulbs.