How does Optoma's HD91+ projector compare to its predecessor? How does Optoma's HD91+ projector compare to its predecessor?

When Optoma released the next generation of its HD91 projector earlier this year it promised even higher brightness and contrast levels. But does the Optoma HD91+ offer enough new features and improvements to warrant the higher price tag? Thanks to the addition of a second generation light source and far superior image quality, we believe it does.

The HD91+’s unique selling point is its DLP LED lighting system, which means that owners can enjoy 20,000 hours of viewing pleasure before having to change the lamp - a saving that it is destined to justify the bigger expense in the long run. Another bonus of LED illumination is that it provides consistent brightness and colour performance for the whole of its lifetime, meaning its out-of-the-box image quality will stick around for at least 20,000 hours.

One of the most noticeable improvements is the HD91+'s increased light output. Optoma promises a 600,000:1 contrast ratio and increased brightness of 1,300 lumens at 1080p Full HD - a huge jump up from the 1,000 lumens and 500,000:1 contrast ratio on offer with the original HD91.

The final noteworthy improvement of the HD91+ is its PureEngine video-processing engine, giving flexibility to choose between five preset colour gamuts, six colour temperatures or alternatively, to fine tune intensity and x/y co-ordinates of primary and secondary colours for ‘ultimate’ accuracy. It also offers a huge suite of picture setup tools that mean the projector is able to support a professional installation by a trained Imaging Science Foundation (ISF) calibrator.

On the whole, the Optoma HD91+ has proven its worth since its release in May this year, having wowed owners and reviewers with its impressive brightness, low maintenance costs and sleek appearance.