Which light intensity level is considered too high for the welfare of lab animals like albino mice?

In the context of laboratory animal welfare, light intensity levels are crucial for the health and well-being of animals. Albino mice, in particular, are sensitive to light due to their lack of pigmentation, which can lead to issues such as stress, increased susceptibility to eye damage, and behavioral changes if exposed to high light intensities.

The level of 400 lux is considered too high for albino mice. This intensity can be uncomfortable and even harmful, as it may induce stress responses and disrupt their natural behaviors, such as nesting and nocturnal activities. Maintaining appropriate light levels is essential for ensuring the psychological and physiological welfare of these animals.

Optimum lighting for lab animals typically ranges lower, as excessive brightness can interfere with their natural circadian rhythms and overall well-being. The other intensity levels listed—200 lux, 325 lux, and 150 lux—are more acceptable for use in housing these animals, aligning better with their adaptive needs and stress thresholds.