It was recognized at the previous report that white fluorescent lamp promoted the growth of animals and affected the urinary components of the animals which were deficient in vitamin D and dosed provitamin D.
In the present report it was examined the effect of white continuous spectrum on growth and vitamin D nutrition and its relation to ascorbic acid. As light source of white continuous spectrum Toshiba D-400 was used, and light of 2800 Lux was given for 3 or 2 hours per day.
The effect of light on growth of rats were recognized even in normal diet group. Two hour exposing was superior to that of 3 hours in growth. The supplement of vitamin D to the animals in dark room was not enough to promote the effect of light on growth; to match growth of light-exposed animals at least ascorbic acid was need excessively. The analysis of urine by TLC cleared also that light effect on vitamin D nutrition was promoted by ascorbic acid.