Floor projection sizing

Simplified views. Game size and brightness are calculated from published throw ratios and rated lumens, with a 0.3 m mount drop; real brightness will be somewhat lower. For the Epson and LU935ST, brightness also allows for the light the lens loses when zoomed in. Models without lens shift (all three BenQ quotes and the LH835ST) throw the image to one side of the lens, so their real shadows are larger than shown; the LU935ST and Epson can centre it. LH830ST and LH860ST are assumed from the quoted specs. The 2.5 to 4 m game width is a suggested range, not a fixed requirement. The brightness benchmark (about 650 lumens per square metre) is a commercial interactive floor system with published specs of 4,000 lumens over about 3.0 by 2.0 m. Headroom line: 2.03 m (80 in), an accessibility guideline for walkways.