Square Perfect 85 Watt Compact Fluorescent Full Spectrum Photo Bulb 4 Pack 5500K day light energy balance spiral energy saver light bulb Optimal color temperature makes this bulb perfect for photography These bulbs are highly rated and recommended by psychologists for SAD (Seasonal Affective Disorder) Approximate Incandescent Equivalent: 300 Watts 85 Watt Fluorescent Full Spectrum Bulb