In addition to being an energy saving bulb, the Bio-bulb is also a full spectrum daylight bulb which claims to produce the closest artificial replication of natural sunlight. It does this by radiating the full light spectrum of visible lightwaves wavelengths from violet light at 380nm (nanometres) to red light at 780 nm at an intensity of 1750 Lumens. Anyone who is unfortunate enough to suffer from Seasonal Affective Disorder (S.A.D) or simply those who long for the summer may well find that the invigorating white light of the Bio-bulb helps to engender a feeling of natural well-being. Full spectrum light is ideal for reading & is claimed to have a wide range of additional beneficial effects including: Improved mood Deeper night-time sleep