New Research Raises Questions About the Health Effects of LEDs

LED bulbs have become the standard choice for home lighting because they use less electricity and last longer than incandescent or fluorescent bulbs. Federal rules now require general-purpose bulbs sold in the U.S. to meet a minimum efficiency level, effectively phasing out most incandescent bulbs, though a bill in Congress has proposed reversing that rule. It has stayed stuck in committee for over a year, so the LED-favoring standard remains in place for now.

Two professors at University College London have published research raising a different question about LEDs: whether the narrow light spectrum they produce could affect mitochondria, the energy-producing parts of human cells. The concern centers on the quality of light LEDs emit, not their energy savings, and it echoes an earlier warning from the American Medical Association that LEDs with too much blue light can disrupt sleep-wake cycles. This is a newer line of research, and the practical effect on health is still being studied.

For now, there's no specific guidance changing what homeowners should do about their light bulbs. If you've switched to LEDs for the energy savings, those savings and the efficiency rules behind them remain unchanged. This is simply an area of research worth watching as more findings come out on how the spectrum of light in our homes might affect us, separate from the question of energy use.