The core of the FeatherBrite line of products revolves around a very special source of light. The FeatherBrite Bulb emits light that is very close to that of natural sunlight. Sunlight and artificial sources of light are measured by color temperature and rendering. If you were to consider the intensity of the sun at noon daylight, it is about 5500 degrees Kelvin (K). Natural light not only provides warmth, but brings out the intensity of colors in a way that artificial fluorescent lighting rarely mimics. The FeatherBrite Full Spectrum 20 Watt Spiral Compact Bulb emits the same color temperature as the sun at high noon.
Natural daylight is also measured at a color rendering index (CRI) of 100, which shows the vibrance and intensity of colors in and around our environment. The FeatherBrite Bulb has a CRI of 91, and will bring out colors in your bird's feathers that you may not have even known existed while using a standard flourescent cage light.