Deliver the essential lighting your bird needs with the Vital Sun Full Spectrum Light Bulb. This 20-watt spiral bulb produces UVA light at 4% and UVB light at .05%, both necessary for your bird's health. It also provides 5500 K illumination and is ideal for Vitamin D3 absorption. Mount your fixture above the cage, never on the side, and provide 4-6 hours of light per day for optimal health.