Keystone correction limited to conventional +/-25 degrees horizontal and +/-30 degrees vertical no 4-corner control.Only option for control over a LAN is Crestron RoomView.Not dust resistant, which limits usefulness for dusty environments and increases maintenance needs.39 dB audible noise at full power and 33 dB in Eco mode is highest rated noise level in the group.Just 19.4 pounds-the lightest projector in this group by far-for easier set up.In addition to all of the common features listed above, the NEC P502HL-2 has the following: 2 year warranty is shortest in the group, but it includes 2 year/20,000 hours for the light source and advanced exchange.Supports only Crestron RoomView and built-in web interface for control over network.Noise level rated at high end of typical: 36 dB in full power mode, 32 dB in Eco mode.Certified IP5X dust resistant, which makes it usable in dusty environments, and-together with suitability for 24/7 operation-makes it an excellent choice for full time maintenance-free applications.Set of two 10-watt speakers for robust built-in stereo audio.1.8x zoom is the longest zoom in this group, 1.2:1 - 2.13:1 throw ratio.5,400 ANSI lumens a slightly higher rating than the competition.In addition to all of the common features listed above, the Dell 7760 has the following: 30.4 pounds: largest and heaviest projector in the group.1.5x zoom, with 1.38:1 - 2.13:1 throw ratio, slightly less zoom range than other projectors in this group.Center placement of lens for easy positioning during installation.DICOM Sim mode for medical presentations and classrooms.Along with Crestron RoomView, supports Extron and PJ-Link for control over a network.Certified IP5X dust resistant, which makes it usable in dusty environments, and-together with suitability for 24/7 operation-makes it an excellent choice for full time maintenance free applications.3 year warranty with advanced replacement includes light source.2 HDMI ports, 1 with MHL in a hidden compartment designed for a wireless dongle.HD-optimized 12-element, all-glass, low-dispersion lens.In addition to all of the common features listed above, the BenQ LH770 has the following: (Btw, if you want to see all specs side by side on the Compare page, click here). So how do they differ? Let's take a closer look to see what each projector has (or claims to have) as well as what it lacks compared to the competition. That is a LOT of identical or similar features between five projectors. 24/7 operation for signage applications. 360-degree installation in pitch, roll, and yaw.4-corner keystone correction (H+V correction only in the NEC-P502HL).Laser-phosphor light engine with 20,000 hour life.These five high performance HD projectors have a wide array of features in common including all of the following (exceptions noted): If you're in the market for a 5000-lumen, Full HD projector designed for 24/7 operation, or for a large conference room or classroom, house of worship, restaurant or sports bar, here are FIVE projectors competing for your order:
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