Farm Broiler Chicken Lighting Welfare Standards

Lighting programs in commercial broiler houses significantly affect bird welfare through their influence on rest, activity, eye health, and biological rhythms.

Key Facts

Traditional broiler lighting used near-continuous light (23 hours) to maximize feed intake and growth rate
Continuous or near-continuous lighting disrupts circadian rhythms and prevents adequate rest, increasing leg disorder risk
EU welfare standards require broilers to have at least 6 hours of darkness per day, with a further 4-hour dim period recommended
Higher-welfare certification schemes such as RSPCA Assured require 8 hours of darkness with controlled dawn and dusk transitions
Dimmer-controlled lighting that mimics natural light transitions is associated with reduced fear responses in broiler flocks
Hens under better lighting programs show more natural activity patterns including foraging and dustbathing during active periods
Blue-enriched light spectra have been studied for effects on chicken visual comfort and behavior, as chickens see UV light

Welfare Considerations

Lighting management has profound effects on broiler welfare through its influence on rest, circadian health, eye development, and behavioral opportunity. Near-continuous lighting designed to maximize consumption suppresses sleep and disrupts biological rhythms in animals that evolved to rest during darkness. The minimum six-hour darkness requirement in EU law represents a baseline rather than a welfare optimum — higher welfare programs with eight-plus hours of darkness and controlled transitions produce measurably better welfare outcomes. The cost of better lighting programs is minimal, making this one of the highest-value and lowest-cost welfare improvements available in broiler production.

What You Can Do

Choose chicken from certification schemes requiring minimum 8 hours of darkness and controlled light transitions
Advocate for lighting welfare standards in broiler regulations to be updated to reflect evidence from higher-welfare programs
Support research into optimal lighting spectra and programs for broiler welfare beyond simply minimum darkness hours
Reduce consumption of standard commercial chicken where near-continuous lighting remains common practice
Ask retailers about their broiler welfare sourcing standards and whether they specify lighting program requirements