The short answer is that chickens don't have a simple, universal "liking" for red light in the way we might prefer a favorite color. Instead, red light is widely used in poultry farming because it triggers specific physiological and behavioral effects that are useful for managing flocks-especially for reducing aggression and boosting egg production. The relationship is more about practical benefits than the birds' visual preference.
1) Red Light Reduces Cannibalism and Feather Pecking
One of the most established uses of red light is to curb harmful social behaviors. Under red illumination, the incidence of cannibalism and feather pecking in laying hens is significantly reduced. Studies have found that red light can make the pecking order less rigid and reduce the birds' sensitivity to light, leading to a calmer social environment. For farmers, this is a major welfare and economic benefit, as it helps prevent injury and death in the flock without resorting to beak trimming.
2) Red Light Stimulates Reproduction
Red light is particularly valuable for laying hens because it directly promotes reproductive development. Research confirms that red-spectrum light stimulates the reproductive axis and enhances ovarian activity. This effect is due to the specific wavelength penetrating tissue and stimulating extra-retinal photoreceptors, which leads to earlier sexual maturity and improved egg production. Consequently, red or white light is considered beneficial for egg production in chickens and quail.
3) The Catch: Preference Varies by Age and Purpose
It is important to note that "liking" depends on the bird's age and purpose. While red light has clear management benefits, controlled preference tests show that meat chickens (broilers) actually avoid red light in feeding zones and, when given a choice, quickly develop a preference for blue light over red. In these studies, birds reared under red light were also found to be more active and aggressive, with greater wing-stretching and floor-pecking.
4) It supports egg laying and sexual development
Because of the mechanism above, red or warm-white light (which contains a strong red component, typically 2700–3500 K) is particularly effective for laying hens and breeders. It helps bring birds into production earlier, sustains higher peak egg output, and supports better reproductive performance compared with pure blue or green light.
Blue and green light are better for growth and muscle development in young birds or broilers, but they are far less effective (or even inhibitory) at stimulating the reproductive system.
5) Behavioral side benefits
Red light makes blood and fresh wounds less visible, which can reduce feather pecking and cannibalism.
Warm light with a red bias is often calming for adult layers and can lower aggression compared with cool white light.
In some preference tests, older broilers have shown a stronger preference for red light than for green.
The use of red light in poultry houses is driven by its ability to suppress harmful pecking and stimulate egg-laying, rather than a genuine fondness for the color by the chickens themselves. The optimal lighting choice is a carefully calibrated management tool, not a matter of simple preference. you can see more information on http://www.benweilight.com
