The color temperature requirements for tunnel lights are usually 3500-6500K, of which 5000-6500K cold white light is recommended for the main lighting section, and warm white light of about 3000K may be used at night or on special sections to reduce glare.
Specific specifications and requirements include:
Color temperature standard for main lighting section
Most specifications require the use of 5000-6500K cold white light (close to natural light) in the main lighting area of the tunnel, which can provide good visual clarity and reduce driver fatigue. For example:
Central area of the driving route: the color temperature is maintained at 5000-6500K;
Basic lighting section: LED light sources with a color rendering index ≥65 and a color temperature of 3500-6500K are allowed.
Adjustments for night or special sections
In areas where glare needs to be reduced (such as exit sections or night mode), it may be switched to warm white light of about 3000K to enhance visual comfort. For example:
Warm white temperature (3000K): used to alleviate the problem of strong light contrast when driving at night.
Technical basis
High color temperature (cold white light) can improve alertness, but long-term use may increase visual fatigue;
Low color temperature (warm white light) is softer and suitable for scenes that need to reduce visual stimulation.
It is worth noting that the requirements for color temperature may vary in different sections and time periods. Modern intelligent lighting systems can achieve dynamic color temperature adjustment to adapt to environmental changes.
