the effect of lighting regimens onproductive performance in two strains of laying hens (Matrouh and Silver Montazah) from 22-42 weeks of age was studied. A total number of 168 hens at 22 weeks of age (84 female each) were housed in floor pens. At 24 weeks of age, each strain was randomly distributed to 4 treatments (21 hens/ treatment) in 3 replicates 7 hens/ each. The first treatment was served as control group (16hrsL: 8 D); the second treatment was subjected to (18 hr. L : 6 D); the third treatment was subjected to (16 hr. L: 8 D)+antistress, the last treatment was subjected to (18 hrs L : 6 D)+ antistress. Where, light treatments (either 16 hr. or 18 hr. daily) were commenced from 24 to 42 wks of age with constant light intensity of 40 Lux. The antistress was Selenium Yeast (Organic Selenium) at concentration of 0.4 mg/kg diet.The obtained results reveal that: Bodyweight (BW) and growth rate (GR) of Silver Montazah strain were no significantly than the Matrouh strain. Also, BW and GR in the treatments that subjected to 18 hr. light were lower than that subjected to 16hr light. The addition of antistress improved BW and GR, but this improvement was not significant. Egg production rate was higher in treatment subjected to 16 hr light compared with 18 hr. light, also, it was observed that, also egg production rate was higher in Silver Montazah strain compared with Matrouh strain. The addition of antistress had positive effect on egg production rate. Egg weight was higher in Matrouh strain than Silver Montazah strain, and in treatment subjected to 16 hr compared with 18 hr light. Also the addition of antistress raised the egg weight at all ages. Mortality rate (MR) was higher in the treatment that subjected to 18 hr light compared with 16 hr. light and in Silver Montazah than Matrouh strain, but this increase was not significant. The antistress reduced MR, but this reduction was not significant. It is concluded that, using 16 hr. light daily and Selenium Yeast supplementation improved the productive performance in development laying hens.