Square Perfect 3075 Professional Quality 45 Watt Compact Fluorescent Full Spectrum Photo Bulb 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 45 Watt Fluorescent Full Spectrum Bulb