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The Sunlite 250T10 Frosted Halogen Double Envelope Lamp (250W / 120V) is a frosted double envelope T10 bulb designed primarily for showcase applications. The 250W/120V bulb outputs 4,000 lumens and has an average rated life of 2,000 hours. Additionally, this bulb is mercury-free so it doesn't require special disposal at the end of its lifetime.