Abstract: Objective: The aim of this study was to investigate the effects of different wavelengths of light on egg production and associated hormonal changes during the later stages of productive period in white leghorn hens. Methodology: The effect of light colour on egg laying and endocrine profiles during 82-92 weeks of egg production was examined. Hens were exposed to normal (450 nm, n = 12, control) and far red (675 nm, n = 12, treated) sources of light. Results: Light intensity was equalized at photon output. Total egg production per hen was significantly influenced by the colour of light with the most eggs procured in red light and the fewest in normal light. Hens were more sensitive to light colour with elevated levels of estradiol (E2β), progesterone (P4), GnRH mRNA, Luteinizing hormone (LH) and egg production. Hens in normal light produced significantly fewer eggs than those under red spectrum light. The GnRH mRNA level was higher (p<0.01) in treated birds with high concentrations of LH, E2β and P4 in plasma. More egg lay, less pause days in treated group may be the result of high GnRH associated with high concentrations of LH, E2β and P4 concentration required for completion of egg formation and egg lay. Conclusion: It can be concluded that the red spectrum of light at 675 nm of wavelength of light may influence GnRH, gonadotrophic, gonadal hormones and increases egg production in ageing hens.