Lighting programmes in poultry houses significantly affect welfare by influencing activity levels, feeding behaviour, sleep, and the risk of welfare problems including feather pecking.
Light management profoundly affects poultry welfare. Insufficient darkness prevents normal sleep cycles. Overly dim lighting reduces activity and access to resources. Appropriate dimming programmes during the dark period, minimum 8-hour darkness, and where possible natural light access represent the welfare-optimal lighting approach. Welfare monitoring should include assessment of light uniformity across the house.