Direct from a museum install units have just 8000 lamp hrs (less than half of expected life).

Never toured, has spent it's life hanging from a ceiling 

The Panasonic PT-MZ880 Series 3LCD SOLID SHINE projectors are an excellent choice for learning environments. This projector series delivers vibrant, bright, and colorful image quality and its compact, lightweight design is flexible to fit in any space. Since classrooms require reliable, consistent operation, the PT-MZ680 projector's eco-friendly design enables up to 20,000 hours of virtually 24/7 maintenance-free operation reducing labor, installation time, and overall total cost of ownership.

• 6,000 ISO lumens
• Compact and lightweight body, designed with ultra-low noise operation
• Wide lens shift area and ultra-short throw lens to expand installation capability
• Edge blending function to realize versatile space creation
• A significant contribution to sustainability thanks to low power consumption and washable Eco Filter
• 3,000,000:1 dynamic contrast ratio