Designers Edge L-22 Rough Service Work Light Replacement T-3 Bulbs with Hard Case, 300-Watt, 6-Pack Includes Bulb Buddy Case and (6) 300-Watt Halogen replacement Bulbs Foam inserts in the case protect each bulb individually The unbreakable plastic case is heavy duty Halogen Bulbs have T-3 Shape, 4-5/8-inches long Rough Service bulb has 2x the lifespan as regular, 4000-hour rated life with heavy duty filament support