This is a set of four new premium quality PBL 85 watt photo fluorescent bulbs. These bulbs have a standard E26 Edison socket, so they will fit into any standard light receptacle. The 85 watt bulb is equivalent to a 425 watt incandescent lamp. These bulbs are flicker-free and the average life is 8,000 hours. Lower heat, correct daylight color balance and long life make these the perfect alternative to incandescent photo floods. These bulbs are a great addition for your photography and video lighting needs. These can also be used as grow light bulbs, craft light bulbs or reading light bulbs.