The most vital element that influences our psyche and health - and which is at the same time the least conscious need - is light. When daylight is insufficient Viva-Lite® full spectrum tubes come into play. Thanks to special materials used and a highly sophisticated manufacturing process they create bright, balanced full spectrum light.Viva-Lite® T5 full spectrum (FS) high-output X 4 (unit) tube lights are designed to simulate natural daylight indoors, great for plants and all living creatures.