The BioBulb is a full spectrum daylight bulb that uses 75% less energy than a standard light bulb.
The BioBulb bulbs issue a massive 1750 (25w) and 1250 (15w) lumens respectively (a lumen is a way of measuring natural light. A standard 60w bulb only manages 600 lumens, so that's over three times as much) and closely replicates sunlight, which may improve mood, nighttime sleep and daytime energy.
Anyone prone to Seasonal Affective Disorder (SAD) or who simply longs for summer may find that its flicker-free white light helps to restore their natural equilibrium. They are ideal for reading and most pleasing to the eye.