The positive influence of monochromatic and combined monochromatic light of a certain spectrum on the performance of broiler chickens is known. However, in different age periods of cultivation, the optimal spectrum is different. At the same time, in the well-known studies, during the entire growing period, the light of the same color range was used or it changed discretely – by a sharp transition from one to another, which, in our opinion, does not allow to fully use the advantages of monochromatic and combined monochromatic lighting. Given the above, our research aimed to study the effect of a smooth change in the light spectrum in the house during the period of broiler chickens growing on their growth and development. The lighting options were investigated: 1st – white light (5000 K) throughout the growing period; 2nd – up to 10 days green (540-570 nm), from the 11th day of cultivation – blue light (470-500 nm); 3rd – combined green-blue (50% / 50%) light during the entire growing period; 4th –combined green-blue light during the entire growing period with a smooth change in their ratio from 0 % blue and 100 % green at the daily age to 100% blue and 0% green at 6 weeks of age. As light sources used LED lamps. It was found that the last option of lighting contributed to the increase in live weight of broiler chickens at 6 weeks of age by 144.8 g or 5.6 % compared with those that were grown under white light (P<0.05). Broilers that were raised under this spectrum of light also tended to have an advantage in weight compared to chickens that were raised under other lighting options. No statistically significant difference was found between broiler chickens that were raised under various lighting options and for the safety of birds, feed conversion and slaughter yield.