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"Heat stress stops the body's capacity to exert, so workers are less able to complete production targets," said Achyuta Adhvaryu, an assistant professor at the University of Michigan Ross School of Business and one of the study's authors.

The researchers studied the staggered rollout of the LED lights in the factories over four years. They found the LEDs cost about $6,300 to install, and the energy savings was about $3,000 per year.

But increased profits from efficiency gains were more stark; an increase of $41 per operating day for each factory, or nearly $13,000 per factory per year.

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