his work was conceded to study, the effect of some light treatments (type and program) on productive performance and some meat constituents of Fayoumi chickens during summer season under hot climatic conditions of Upper Egypt. Three hundred and sixty chicks, fifteen weeks old; were randomly divided into six experimental groups (6 groups, each group was divided into three replicates/ 20 birds each).Group 1, the chicks were exposed to continuous common light program (12h light: 12h dark/day) (with intensity 10 luxes) and was considered as a control (C); Group 2 (T1), the chicks were exposed to intermittent common light program (6h light:6h dark) each 12h. of day; Group 3 (T2), the chicks were exposed to biomittent common light program (30 minutes light: 30minutes dark) of each hour of day; Group 4 (T3), the chicks were exposed to continuous flash light program (12h light: 12h dark/day); Group 5 (T4), the chicks were exposed to intermittent flash light program (6h light:6h dark) each 12h. of day; Group 6 (T5), the chicks were exposed to biomittent flash light program (30 minutes light: 30minutes dark) of each hour of day. Chicks were reared under the same managerial, feeding and hygienic conditions throughout the experimental period. During of the experiment body weight (BW), body weight gains (BWG), feed consumption (FC), feed conversion (FCR), carcass characteristics and meat analysis were estimated. Flashed light groups caused elevation of body weight, body weight gains and feed intake significantly compared to control, while there wasn't significant difference between groups for feed conversion ratio. Flash lighting programs improved carcass characteristics compared with those exposed on common lighting groups. Flash lighting program increased moisture percentage and reduced fat percentage in meat (P<0.05). It can be concluded that applying the flash light regime tend to improve all measurements studied without any side effect on Fayoumi chickens during growing period.