Optoma UHD35X 4K DLP Projector

The Optoma UHD35X 4K DLP Projector is an excellent budget 4K projector that is sure to please someone looking for some extra detail in their movies and games without a big price premium over 1080p models. The mode with the highest light output on the Optoma UHD35 is Bright with the Brightness Mode lamp setting to Bright and Brilliant Color set at 10. We measured brightness on two different samples of the UHD35 after Optoma's team expressed concern about our results on the first round, but a second sample, tested with direction from Optoma, measured similarly and recorded a maximum of 2,681 ANSI lumens, or 77.3% of the published 3,600-lumen spec.

This is slightly under the maximum 20% tolerance accepted for ANSI or ISO lumen specs and below what Optoma says it measured for these samples. We are investigating and will update our review as necessary. There are nine different display modes on the Optoma UHD35—Cinema, HDR, HLG, HDR SIM., Game, Reference, Bright, User, and 3D. An ISF calibrator can unlock and calibrate ISF Day, ISF Night, and ISF 3D modes. The HDR, HLG, and 3D modes are automatically enabled when the Optoma detects one of those signals.

The brightest display mode is Bright, which exhibits the expected green tint found in the brightest mode of many projectors. Several brightness measurements of two different samples, conducted with direction from Optoma, resulted in a highest recorded measurement of 2,681 ANSI lumens using the usual nine-point averaged methodology. At 77.3% of the rated spec, this falls below the 20% tolerance allowed for ANSI or ISO lumen measurements, and is below what Optoma says it measured for either of our two samples.

We are continuing to explore what might be causing the discrepancy and will update our review accordingly as needed.