The LM55-F400N is a 55-inch UHD monitor designed for 24/7 continuous professional use, with a VA panel, DLED backlighting and 4K 3840 × 2160 resolution. It offers 400 cd/m² brightness , 5000:1 contrast, 178°/178° viewing angle and 6.5 ms response time for smooth and detailed images. It integrates 2 HDMI 2.0, VGA, 2 USB 2.0, RS-232 , audio input and output, as well as 2 10 W speakers . The three-sided ultra-narrow bezel design, VESA 200 × 300 mm compatibility and desktop or wall installation make it ideal for video surveillance systems and professional environments. Dahua
LM55-F400N | 55' UHD LED MONITOR

The Dahua LM55-F400N is a 55" 4K UHD professional monitor with VA DLED panel, resolution 3840 × 2160 at 60 Hz and continuous 24/7 operation, ideal for video surveillance systems and control rooms. It offers 400 cd/m² brightness , 5000:1 contrast, 178°/178° viewing angle and 6.5 ms response time. It integrates 2 HDMI 2.0, VGA, 2 USB 2.0, RS-232 , audio inputs/outputs and 2 10 W speakers , with Flicker-Free technologies and Low Blue Light protection. It supports table or wall installation via VESA 200 × 300 mm .
Main specifications:
- Display: 55" VA DLED 4K UHD
- Resolution: 3840 × 2160 @ 60 Hz
- Use: Continuous 24/7
- Ports: HDMI 2.0, VGA, USB, RS-232
- Audio: 2 × 10 W
- Mounting: VESA 200 × 300 mm
Further details
Technical data sheet
| LM55-F400N | |
| Display | |
| LCD Technology | GO |
| Backlight | DLED |
| Screen Size | 55 inches |
| Aspect Ratio | 16:9 |
| Viewing Size | 1209.6 (W) × 680.4 (H) mm |
| Screen-to-Body Ratio | ≥95% |
| Viewing Angle | 178° (H) / 178° (V) |
| Display Mode | Horizontal |
| Pixel Pitch | 0.315 mm × 0.315 mm |
| Pixels Per Inch | 80.7 |
| Resolution | 3840 (H) × 2160 (V) |
| Refresh Rate | 60 Hz |
| Display Color | 8 bit + FRC |
| Color Gamut | 72% NTSC |
| Brightness | 400 cd/m² (typ.) |
| Contrast Ratio | 5000:1 |
| Response Time | 6.5 ms |
| Lifespan | 30,000 hours |
| Surface Treatment | Haze 25%, 3H |
| Flicker-free Technology | Yes |
| Low Blue Light | Blue light protection software |
| Device Ports | |
| Input Port | 2 × HDMI 2.0 (3840 × 2160@60 Hz), 1 × VGA (1920 × 1080@60 Hz), 2 × USB 2.0, 1 × Audio in, 1 × RS-232 in |
| Output Port | 1 × Audio out |
| Speaker | 2 × 10 W |
| Power & Environmental Conditions | |
| Power Supply | 100–240 VAC (±10%), 50/60 Hz |
| Power Type | Built-in Power |
| Power Consumption | 72 W (basic), 98 W (typ.), 104 W (max) |
| Standby Power Consumption | <0.5 w="" td=""> |
| Operating Temperature | 0 °C to +40 °C (+32 °F to +104 °F) |
| Operating Humidity | 10%–85% (RH) |
| Storage Temperature | –20 °C to +60 °C (–4 °F to +140 °F) |
| Storage Humidity | 5%–90% (RH) |
| General | |
| Product Dimensions | 1,225.6 mm × 705.3 mm × 81.6 mm (48.25" × 27.77" × 3.21") (W × H × D), without base |
| Package Size | 1,320 mm × 805 mm × 125 mm (51.97" × 35.63" × 4.92") (W × H × D) |
| Frame Width | U/L/R/D: 1.1mm/1.1mm/1.1mm/14.8mm |
| Net Weight | 9.85 kg (21.72 lb) |
| Gross Weight | 13.20 kg (29.10 lb) |
| Casing Color | Black |
| Control Mode | Remote Control, RS-232 |
| Status Indicator Light | Yes |
| VESA Wall Mount | 200mm × 300mm (7.87" × 11.81") |
| Accessory | Power cord, base, HDMI cable, remote control, user's manual, legal and regulatory information etc. |
| Optional Accessory | Wall mount |
| Certification | |
| Certifications | CE EMC, CE LVD, CE ERP |


