A comparison was made between the weight and height increases of first school children illuminated under either ‘full‐spectrum’ or ‘cold white’ fluorescent tubes. 80 children distributed between four schools were observed during 1980/81 and the experiment was repeated the following year using a similar number of children. Although significant differences in height and weight gains were found between schools no differences attributable to either sex of children or lighting treatment were detected. The results of these experiments are discussed in terms of the findings and experimental design of previous workers.