10.—(1) All houses must have lighting with an intensity of at least 20 lux during the lighting periods, measured at bird eye level and illuminating at least 80% of the usable area.
(2) A temporary reduction from that lighting level is permitted where necessary following veterinary advice.
(3) Within 7 days from the time when the chickens are placed in the house and until 3 days before the expected time of slaughter, the lighting must follow a 24-hour rhythm and include periods of darkness lasting at least 6 hours in total, with at least one uninterrupted period of darkness of at least 4 hours, excluding dimming periods.