Lightbridge CRLS

Lightbridge CRLS

Definition and Architecture

The Lightbridge Cable‑Rail Lighting System (CRLS) is a suspended track enabling smooth horizontal movement of lights or cameras. It consists of stainless‑steel cables anchored between rig points, with a motorized trolley that glides along the span, carrying fixtures or small cameras.

Technical Specifications

• Load capacity: Up to 50 kg per trolley
• Span length: Customizable, typically 10–50 m
• Speed control: Variable from 0.1 to 2 m/s via integrated motor and DMX interface
• Safety features: Redundant cables, emergency brakes, and load sensors

On‑Set Applications

CRLS enables dynamic lighting moves—gradual light shifts across a scene—or seamless camera slides for establishing shots. It’s popular on long corridor sets or tunnel sequences where a stationary dolly is impractical.

Advantages and Limitations

Advantages:

• Quieter than rail dolly systems
• Minimal floor obstruction
• Programmable repeatable moves

Limitations:

• Requires structural rigging points
• Installation time and cost
• Wind sway outdoors

Best Practices

• Conduct load tests before operation.
• Program acceleration/deceleration curves to avoid sudden jerks.
• Use dampers to minimize cable oscillation.

Trivia

• Originally developed for architectural lighting in concert venues.
• Some filmmakers nickname it the “sky rail” for its overhead presence.