Chicken Lighting Welfare Standards

Lighting regimes in poultry housing significantly affect broiler and laying hen welfare through effects on behaviour, sleep, and circadian rhythm.

Key Facts

Near-continuous lighting in conventional broiler systems was historically used to maximise feeding time and growth rate
EU regulations now require minimum 6 hours of continuous darkness per 24 hours in broiler production
Continuous lighting suppresses melatonin secretion and disrupts circadian physiology in poultry, causing chronic stress
Adequate dark periods improve broiler leg health, reduce sudden death syndrome, and reduce fearfulness
Laying hens require seasonal light variation to regulate reproductive cycles — day length management drives laying patterns
Spectral quality matters — poultry perceive UV wavelengths, and full-spectrum lighting improves behaviour and welfare indicators

Welfare Considerations

Lighting management in poultry production has direct and significant welfare consequences that are often underestimated relative to feeding and housing system welfare discussions. The historical practice of near-continuous lighting in broiler sheds was driven by the commercial logic that birds eating all the time grow faster. Research demonstrates the welfare cost: disrupted circadian rhythms impair immune function, worsen leg health, and reduce rest quality. The modest productivity cost of adequate dark periods is outweighed by the welfare gain and by secondary productivity benefits from healthier birds. For laying hens, light management is the primary tool for regulating reproductive cycles — correct light management enables year-round production, while poorly managed lighting causes reproductive problems and associated welfare costs. Full-spectrum lighting with appropriate intensity and UV provision represents current best practice.

What You Can Do

Support broiler certification schemes that require minimum 8 hours of darkness per 24 hours in their standards
Advocate for mandatory minimum dark periods exceeding current EU minimums as a welfare standard in poultry housing
Support research into optimal spectral quality and intensity standards for poultry welfare across species and production systems
Choose eggs from laying hen systems that demonstrate appropriate photoperiod management in their welfare certifications
Engage with poultry welfare organisations working on lighting standard reform in major producing countries