I found the provided distance chart to be accurate. The throw ratio corresponds to approximately 2.4 feet to 32.6 feet, allowing projection of an image as small as 30 inches diagonal up to a massive 300 inches diagonal. Its lens has a 1.15-1.50:1 throw ratio for a 1.3x manual zoom and focus, which, thanks to smooth mechanical operation, made it easy to dial in the image. The HT4550i features optics with a 0% offset to the screen, so the centerline of the lens from a ceiling-mounted projector would be at the center of the projected image prior to being moved down by the available -60%vertical lens shift. BenQ offers its CM00G3 Universal Ceiling Mount as an option, with a $59 MSRP at the time of writing. It supports various mounting options, including standard tabletop or ceiling for front- and rear-projection. Weighing 14.55 pounds and measuring 16.54 x 5.31 x 12.28 inches (WHD), the HT4550i is not a lifestyle or portable projector but is still compact and lightweight enough to be moved around with ease. However, the dynamic contrast does improve when SmartECO is used. The HT4550i has a published contrast specification of 2,000,000:1 with dynamic light source dimming, but its native contrast ratio without light source dimming measured at 900:1, which is relatively low and noticeable in content. The light source has a long life of 20,000 hours in the Normal and SmartECO Light Source Modes, and 30,000 hours in ECO, ensuring years of use without the need for bulb replacements. Nevertheless, the best picture modes do measure well for accuracy and provided a fair amount of measured brightness and vibrant images. It's good to see an LED projector hit this kind of brightness, however, this mode is noticeably green-biased and its default color temp cannot be adjusted from the projector's Native setting to the more accurate Normal color temperature. Our sample's 4LED light source (RGGB, with an extra green LED for brightness) also exceeded the specified 3,200 ANSI lumens, measuring 3,413 ANSI lumens in its brightest picture mode. During testing, the HT4550i thankfully provided a crisp and detailed 4K UHD image without demonstrating any rainbows, which can sometimes occur with single-chip DLP projectors. This resolves the 8.3 million pixels on the screen to display 4K resolution. The new BenQ HT4550i utilizes a relatively new Texas Instruments 0.65-inch DMD DLP chipset to achieve its 4K UHD resolution of 3840x2160 from a 1080p native array with four-phase pixel shifting.
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