The aim of the study was to determine the effect of different light intensity on whelping interval, number of litters per year and a total number of born chinchillas per year. The studies took place in 2001 through 2003. The analysis involved 480 standard chinchilla. In chinchilla sheds, 12-hour light regime was applied; average illumination was 5 W∙m^-2, while intensity was 0-90 lx. In 2001, at a selected part of the shed, new lamps were installed, which were of higher power, i.e. 10 W∙m^-2, with 91-270 lx intensity. The whelping interval decreased with an increase in light intensity. The highest number of litter and total offspring from female per year were obtained under the higher range of light intensity. The range of light intensity between 150 and 240 lx was the most optimal.

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