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Crestron Green Light® Dimmer Expansion Module, Cresnet®


A single-channel expansion module controlled by Cresnet®[1] or DALI that provides dimming control for many different load types including LED, incandescent, magnetic low-voltage, neon/cold cathode, or 2-wire dimmable fluorescent lighting loads.

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Key Features

  • Single-channel lighting dimmer
  • Crestron® system integration via Cresnet®
  • Supports dimmable LED, incandescent, magnetic low-voltage, neon/cold cathode, and 2-wire fluorescent lighting loads
  • Rated 16 Amps at 100-277 Volts AC
  • Forward phase dimming
  • Zero-cross filter technology for reduced lamp flicker
  • Extreme stability under noisy power line conditions
  • Built-in air gap relay
  • Closure-activated override mode
  • UL® 924 listed for emergency lighting control
  • Surface mountable NEMA Type 1 enclosure
  • Mounts on a wall panel or above a suspended ceiling
  • UL 2043 listed for installation in an environmental air handling space


Product Overview

The Crestron Green Light® GL-EXP Series delivers a family of professional lighting control modules for Cresnet® or DALI® based lighting systems. Designed for easy installation on a wall or above a suspended ceiling, these modules offer a perfect solution for adding extra lighting zones to any system without requiring an additional lighting cabinet.

The GL-EXP-DIM-CN is a single-channel dimmer expansion module designed to control LED, incandescent, magnetic low-voltage, neon/cold cathode, or 2-wire dimmable fluorescent lighting loads. Utilizing proprietary zero-cross filter technology, the GL-EXP-DIM-CN compensates for line voltage and frequency fluctuations, providing superior immunity to power line noise and a dramatic reduction in lamp flicker.

Forward Phase Dimming
The GL-EXP-DIM-CN employs forward phase (leading edge) dimming to handle inductive load types like magnetic low-voltage and neon, as well as incandescent, LED, and 2-wire fluorescent.

Cresnet® Communications
The GL-EXP-DIM-CN interfaces with a Crestron® control system via Cresnet. Cresnet is a simple 4-wire network bus that provides the communications backbone for a system of Crestron lighting dimmers, switches, keypads, shades, thermostats, and other devices.

Emergency Lighting Control
The GL-EXP-DIM-CN is UL® 924 listed for use in controlling an emergency lighting load. In the event of a power failure, a contact closure from a power loss sensor (Crestron GLS-PLS-120/277, sold separately) activates the override mode in the GL-EXP-DIM-CN to turn on the lighting load if it is off (assuming line power is supplied by a backup power source). The override dimming level can be preset to any value when commissioning the lighting system, so even if the load is already on prior to a power failure, it will change to the preset level when override mode is activated.

Plenum Rated NEMA Enclosure
The GL-EXP-DIM-CN is designed to be mounted to a vertical surface and is UL 2043 compliant to allow for installation in an environmental air-handling space above a suspended ceiling. Conduit knockouts are provided on the bottom and lower sides of the unit. All connections are made via screw terminals behind the front cover.

This product may be purchased from an authorized Crestron dealer. To find a dealer, please contact the Crestron sales representative for your area. A list of sales representatives is available online at or by calling 800-237-2041.

The specific patents that cover Crestron products are listed online at:

Certain Crestron products contain open source software. For specific information, visit

Crestron, the Crestron logo, Cresnet, and Crestron Green Light are either trademarks or registered trademarks of Crestron Electronics, Inc. in the United States and/or other countries. UL is either a trademark or registered trademark of UL LLC in the United States and/or other countries. Other trademarks, registered trademarks, and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Crestron disclaims any proprietary interest in the marks and names of others. Crestron is not responsible for errors in typography or photography. Specifications are subject to change without notice. ©2017 Crestron Electronics, Inc.

Product Specs

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