The PLC-WM5500 is rated at 5500 lumens. Unfortunately, after checking two different units, the highest lumen output we measured was only 3763 lumens. In Dynamic mode (the brightest), we measured 3629 lumens at mid-zoom range. At full wide zoom, this increased to 3763 lumens and at full telephoto zoom; it came in at 2936 lumens. Using Standard mode (which would likely be used for most presentations) resulted in a slight drop to 3378 lumens. Real mode (another potentially popular mode due to its good color) drops slightly to 3102 lumens. There are ten custom user modes labeled Image 1-10 that all start out equivalent to Standard mode and thus came in at 3378 lumens.
Dropping the lamp into Eco mode in Dynamic image mode resulted in a 25% drop in lumen output from 3629 lumens to 2738 lumens. This is still quite high and likely could be used even in large venues with decent light control.
The Sanyo PLC-WM5500 projector in dynamic mode, it's brightest setting.