The use of light emitting diodes (LEDs) as a source of monochromatic light to determine its impact on immunity and meat quality in poultry is investigated in the current review. The use of LEDs in poultry housing is preferred over other conventional light sources. LEDs emitting blue, green and yellow wavelength have been shown to improve the immunity and meat quality responses in broilers. Blue and green light help to promote greater antibody production and immune function, compared to red light. Keeping birds under yellow and green-blue mixed lighting has resulted in softer breast and drumstick muscles while white light improved lean meat and amino acid content of meat. From the available research it can be inferred that birds perform better in terms of meat quality and immunity if reared under the environment of monochromatic light produced by LED for cost-effective and advanced poultry production.

Light presents one of the considerable factors after nutrition and genetics in bird health and welfare. Therefore poultry producers are continuously looking for new and innovative tools to apply in poultry production in order to economise rearing costs and save rising energy concerns. Changes in the light regimen, intensity, duration and wavelength have a profound effect on the behaviour, physiology and production performance of poultry. Moreover, bird welfare is a major controversial issue and the adaptation of a lighting programme with a proper lighting tool could impart a possible solution for the betterment of poultry welfare. Light emitting diodes (LED), due to their various beneficial characteristics over traditional incandescent and fluorescent bulbs; are gaining popularity with poultry farmers. Therefore, it can be suggested that the use of LED in poultry housing is advantageous due to its energy efficiency and long life as compared to the conventional light sources, and with the added benefit of its various colours and higher productivity.