Viewsonic Pro 8400, 4000 ANSI lumens, DLP, 2600:1, 0.9 - 10 m, 31 - 91 kHz, 48 - 85 Hz Viewsonic Pro 8400. Projector brightness: 4000 ANSI lumens, Projection technology: DLP, Contrast ratio (typical): 2600:1. Light source type: Lamp, Service life of light source: 4000 h, Service life of light source (economic mode): 5000 h. Serial interface type: RS-232. Noise level: 33 dB. RMS rated power: 20 W https://www.trustedreviews.com/reviews/viewsonic-pro8400 If there's one thing we hate feeling as technology reviewers, it's confused. Yet that's exactly the emotion we've come away with after spending the past few hours with ViewSonic's Pro8400 projector. The thing is, it was ‘sold' to us as a home cinema proje... Very high brightness for its price, It's light and portable, Images can be watched in ambient light Lots of rainbow effect, Below par black level response, No vertical keystone correction The Pro8400 isn't totally without its charms, we guess, since its extreme brightness for its price could make it worth considering for people who fancy projection-sized images but can't be bothered with blacking out their rooms.However, given the lack of ...