The 8 hour rule
To ensure maximum welfare for pigs, they must not be kept in permanent light or permanent darkness.
In the LBK on the protection of pigs, Section 8, it is stated that pigs must be kept in lighting that follows a 24-hour rhythm and has continuous periods of at least 8 hours per day with light and darkness respectively. The light must also have a light intensity of at least 40 lux.*
With a light meter and automated on/off, it will be possible to utilize the natural light from outside, and only supplement with energy-intensive lighting when necessary. Especially in the winter, it is a problem to achieve the 8 hours with natural lighting.
Automation of on/off provides 100% security for the welfare of the animals – and at the same time ensures that no more energy is used for the task than is absolutely necessary (Fødevarestyrelsen, 2020)*.