Package includes: 4 x 45W 5500k day light balanced fluorescent light bulbs Features: Cool running and with an absolutely consistent color temperature of 5,500K, which matches typical daylight as well as flash. This is a 45 watt bulb specifically to replace those found in our continuous lighting heads. The color rendition index of 92 guarantees that all colors are reproduced accurately. Regular fluorescent bulbs have a very low color rendition in comparison. Always replace your bulbs the bulbs designed for your lighting head. It is UL, CE listed and Energy Star.