Abstract
The growth, gestation and lactation of rats and hamsters subjected to different light intensities (15-2,000 lux) have been investigated. In the male rat, adrenal, testis and kidney weights were higher with increased light intensity, and there was an optimal light intensity (250 lux) for number of litters born, and a different optimum (60 lux) for the number of young per litter. In the hamster there were no differences related to light intensity, apart from an increase in the incidence of anoestrus where light intensities were below 60 lux.
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