| Typical display area | Approximately 0.7 m² | Approximately 2.9 m² | Approximately 4.5 m² | Approximately 5.8 m² total | Match the viewing distance, message length, and available mounting area before comparing electrical specifications. |
| Recommended enclosure rating | IP65 front and rear | IP65 front and rear | IP65 minimum; IP66 preferred for exposed sites | IP65 minimum on both display faces | IP65 protects against dust and water jets. It does not mean the sign can be submerged. |
| Corrosion protection | Powder-coated aluminum or treated steel; sealed cable glands | Powder-coated aluminum cabinet; stainless fasteners recommended | Aluminum cabinet with drainage channels and anti-corrosion coating | Sealed aluminum housings; stainless hardware for coastal locations | Use marine-grade fasteners and enhanced coating near salt water or industrial pollution. |
| Operating temperature target | Approximately −20°C to 50°C | Approximately −20°C to 50°C | Approximately −30°C to 50°C with active thermal management | Approximately −20°C to 50°C | Confirm the supplier's tested temperature range, especially for desert heat or freezing climates. |
| Estimated maximum power draw | About 100 W | About 250 W | About 400 W | About 500 W total | Use maximum draw for circuit sizing; actual consumption is usually lower when brightness is automatically reduced. |
| Illustrative annual electricity use | About 438 kWh/year | About 1,095 kWh/year | About 1,752 kWh/year | About 2,190 kWh/year | Calculated at maximum rated power for 12 hours per day and 365 days per year; real use varies with content and dimming. |
| Brightness control | Ambient-light sensor recommended | Automatic dimming strongly recommended | Automatic dimming and scheduled brightness profiles required | Independent brightness monitoring for each face preferred | Dimming improves night-time legibility, reduces glare, and lowers energy use. |
| Thermal management | Passive ventilation or heat spreading | Aluminum heat sink and airflow path | Oversized heat sinks; temperature monitoring; fans only when adequately protected | Separate thermal paths for front and rear modules | Lower internal temperature generally supports longer component life and fewer brightness-related faults. |
| Expected LED service life | Up to approximately 100,000 hours under rated conditions | Up to approximately 100,000 hours under rated conditions | Typically specified up to approximately 100,000 hours; heat and drive current are critical | Up to approximately 100,000 hours under rated conditions | This is an LED degradation rating, not a guarantee that the complete sign will operate maintenance-free for that period. |
| Power quality protection | Surge protection and fuse protection | Surge protection, grounding, and over-temperature shutdown | Coordinated surge protection, grounding, and circuit isolation | Separate protection for each display face | A qualified electrician should size grounding, disconnects, and surge protection for the installation. |
| Recommended maintenance interval | Visual inspection every 6–12 months | Inspection and cleaning every 6–12 months | Inspection at least every 6 months in dusty or coastal areas | Inspection every 6 months; check both faces and all seals | Shorten the interval where dust, salt, vibration, or severe weather is present. |
| Operating reliability score | 4.2 / 5 | 4.4 / 5 | 4.0 / 5 | 4.1 / 5 | Indicative planning score based on enclosure protection, thermal control, electrical safeguards, service access, and component redundancy. |