LONG LIFE: GoodBulb's 36 watt CFL plug-in bulb is rated for an average of 36,000 life hours. This is more than 3.5 times greater than the industry average of 10,000 hours for fluorescent plug in bulbs. Reduce time and money spent on replacing bulbs in your high ceiling fixtures by making the switch to GoodBulb today. COMMERCIAL GRADE: Designed with premium quality components to ensure the best output, durability, life span, and compatibility with your fixtures. Features instant start and flicker free lighting, making these lamps perfect for the office, school, lab, classroom, or any variety of applications. QUICK & EASY INSTALLATION: These bulbs have a 2G11 4 pin biaxial base, making replacing bulbs simple and fast. And they are compatible with your existing fixture and ballast. This is a direct replacment for many types of brands. See description for compatability chart and specs. UNIFORM LIGHT: High quality color rendering that has a rating of 80 CRI, and casts light evenly in with no dark or hot spots. Designed for use with 2x2 panels, parabolic fixtures, industrial can lights, or any other light source that utilizes a long plugin CFL. GOOD CAUSES: Buy Light. Give Light. One in every seven people in the world live without electricity. A portion of every GoodBulb purchase is used to provide solar powered LED lanterns to families living without electricity. Selecting GoodBulb is a decision to be a light in the darkness. Together, we can make a difference! GoodBulb's PLL36/835 plug in lamps emit a warm soft bright light that is perfect for lighting any area. Designed to fit in 2G11 socket and work with an 36W CFL ballast, they will install with ease. Specification: Wattage: 36 watts Shape: CFL PL-L Base: 4-pin (2G11) Color Temperature: 3500K Lumens: 2400 Lm Lifespan: 36,000 hours Bulb Length: 16.5 inches Bulb Width: 1.7 inches Compatibility: Philips 349423 PL-L 36W/835/4P Sylvania Osram 20582 FT36DL/835/ECO Plusrite 4316 FTL36/2G11/835 Sunlite FT36DL/835 Bulbrite 504538 FT36/835 GE 15867 F39BX/SPX35/RS S6764 FT36DL/835/ECO Ushio 3000409 CF-L36SE/835 Eiko 49294 DT36/35/RS Halco ProLume 109708 PLL36/835/ECO Westinghouse 07019 F36TTL/835