Farrowing House increases weaning weights and milk yield. Gilt House reduces age at puberty and gilts and boars are more sexually active. The Light intensity should be such that a newspaper can be read in the darkest corner of the building. Light intensity can be affected by fly faeces and dust on the lamps.
Fluorescent light is nearer to natural light than incandescent lights.
Also fluorescent lighting uses less electricity than incandescent bulbs. The use of timers ensures a constant period of light.