This study was carried out using 1200 Japanese quail eggs to study the hatch performance of different eggs weight as affected by lighting during incubation. Incubating eggs comprising of small (9-10g), medium1 (10-11g), medium2 (11-12g) and large (12-12g) weight categories incubated under the recommended conditions of the quail eggs with lighting or without. The obtained results indicated that incubated light treatment had significantly better hatchability, chick weight and relative weight gain than dark condition. Also, it significantly increased body temperature, chick breast, liver, ovary and residual yolk sac weight at the 2nd day of age. However, insignificant differences of yolk-free body mass, chick sex, culled and chick weight loss and quality scores were observed among all experimental groups. In regard to the effect of egg size, insignificant differences among eggs size groups for chick sex, culled and chick weight loss. However, highly significant differences were observed in hatchability, yolk-free body mass and quality scores, which improved in medium sized eggs. Insignificant interactions of incubated light × egg weight groups were existed in most studied traits. It could be concluded that the suitable results of growth performance and health performance were obtained for medium sized eggs of Japanese quail with incubated light. Therefore, it could be recommended that light treatment could be applied successfully by the hatchery managers to have a better hatch performance without any significant negative effects on chick quality