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Basic Knowledge of DALI 2.0 Intelligent Dimming System

2025-06-28

DALI 2.0 (Digital Addressable Lighting Interface) is an international standard (IEC 62386) in the field of lighting control. It expands the functions of the original DALI protocol, providing more advanced dimming and control capabilities.

Core Dimming Principle

Digital Dimming Control Uses digital signals instead of analog voltage for control. Dimming level range: 0-254 (8-bit resolution), 0 represents completely off, 1-254 represents different brightness levels.

PWM Dimming Technology Most DALI 2.0 devices use Pulse Width Modulation (PWM) to achieve dimming, adjusting the brightness by changing the duty cycle of the LED on time. Typical PWM frequencies are between a few hundred Hz and a few kHz.

DALI 2.0 Dimming Characteristics

1. Extended Dimming Curves Supports various dimming curves such as linear, logarithmic, and custom, matching the human eye's perception of brightness changes (approximately a square law relationship).

2. Gradient Control Fade-in and fade-out time can be set (0.1 seconds to several minutes) for smooth brightness transitions, avoiding sudden changes.

3. Scene Control Preset brightness scenes can be stored and recalled, supporting up to 16 scene settings.

Multi-Device Synchronization Precise timing control ensures synchronous dimming of multiple luminaires, eliminating brightness variation delays between different luminaires.