Is the PT-VMZ51S bright enough for a lit classroom?

Yes. At 5,200 lumens it is designed for rooms with ambient light, and owners report readable slides with lights on. Very large screens in bright rooms will still benefit from dimming.

How long does the laser light source last?

Panasonic rates it at 20,000 hours in normal mode and 24,000 hours in eco mode. That covers years of typical classroom or meeting-room use without lamp changes.

Does it need a special screen or lens?

No. The built-in 1.6x optical zoom and short-throw lens cover a wide range of screen sizes, and vertical lens shift of up to 44% helps with ceiling mounting.

Can I mount it on the ceiling?

Yes. It supports front, rear and ceiling projection and is built for permanent mounting. Its 14.33 lb weight means a suitably rated mount is needed.

What inputs does it have?

It offers HDMI, USB and wired LAN, plus wireless presentation support and a 3.5 mm audio line-out. There is no DisplayPort or HDBaseT.

Is it good for movies and home theater?

It works, but it is tuned for presentations with a 16:10 aspect ratio and high brightness. Home theater buyers usually prefer a 16:9 or 4K model with lower noise.