Viability and productivity of egg laying hens at different light intensity curve of LED lamps

The dependence of the uniformity of illumination of three-tier cell batteries on the distribution of the luminous flux of LED lamps in space, as well as its effect on the viability and productivity of laying hens, has been studied. The use of group (linear) lenses with different light intensity curve (LIC) as secondary optics in LED lamps is economically viable, convenient in production and operation, and ensures the tightness of light sources. It was found that when they are placed in a poultry house with an interval of 1.5 m horizontally along the cell batteries in the passages between them, the best uniformity of illumination is provided by lamps with a LIC of 110ºx60º with a difference in the vertical plane between the maximum and minimum values of 2.9 lux. The uniformity of lighting at the same time allowed to increase the safety of poultry by 0.7-2.1% compared to other tested variants. The use of LED lights with a LIC of 120ºx120º and 110ºx60º made it possible to obtain almost the same egg production for the initial and average laying hen and, respectively, by 1.6-3.4 and 1.5-3.3% higher than with a LIC of 90ºx70º and 120ºx90º. Chickens at LIC 120ºx120º compared to 110ºx60º, 90ºx70º and 120ºx90º had significantly higher egg mass.