Flexstar M12 to RJ11 Cable/B3 - 10ft

What This Cable Does

Flexstar LED fixtures use an M12 connector — a threaded, locking industrial-grade port — as their onboard dimming interface. Most lighting controllers in the horticulture space, including Flexstar's own Zeus L1 Master Controller, communicate over the RJ11 standard (the telephone-style jack common in 0-10V dimming systems). These two connector formats are physically incompatible without an adapter.

This 10-foot cable solves that directly. One end terminates in an M12 connector that seats and locks onto the fixture's dimming port. The other end terminates in an RJ11 plug that inserts into the controller's 0-10V output port. The result is a clean, low-signal-loss connection that passes the 0-10V dimming command from your controller to the fixture — no wiring, no crimping, no adapters stacked in series.

Who Needs It

This cable is a required component for any operator running Flexstar fixtures that use the M12 dimming port who wants to integrate those fixtures into a centralized lighting control system with an RJ11 output. That includes installs using the Flexstar Zeus controller as well as compatible third-party controllers that output a standard 0-10V signal over an RJ11 port.

It's also the right pull for facilities that are commissioning a new room with Flexstar fixtures and need to confirm every cable in the control run is spec'd correctly from day one. The Flexstar fixture line supports daisy-chaining multiple fixtures in a control zone — each fixture in the chain needs the correct cabling to register on the dimming bus. Using an unverified generic cable in place of the OEM-specified adapter introduces signal integrity risk at scale. For commercial rooms running dozens of fixtures per zone, this is not where you cut corners.

Key Features

The M12 end uses a threaded locking collar — the same industrial connector standard found across commercial horticultural and process automation equipment. A threaded lock-down means the cable stays seated at the fixture even under vibration or incidental contact, which matters in a busy room with HVAC runs, oscillating fans, and regular overhead traffic during canopy management.

At 10 feet, the cable gives enough run to reach a wall-mounted or rail-mounted controller from fixtures positioned across a typical commercial bay without forcing a daisy-chain of extension cords. The RJ11 end is a standard 0-10V control jack and seats securely in any compatible controller port. The B3 designator identifies the specific build configuration for this cable variant within Flexstar's accessory lineup — confirm your fixture model and controller port type against this SKU before ordering.

Fitting This Into Your Control Architecture

In a standard Flexstar installation, the Zeus L1 Master Controller (or a compatible third-party 0-10V controller) outputs a dimming signal over its RJ11 ports. The M12 to RJ11 cable routes that signal to the first fixture in a zone. From there, Flexstar fixtures can be daisy-chained using the appropriate fixture-to-fixture cables, with the entire chain responding to the controller's programmed intensity schedule, sunrise/sunset simulation, or environmental triggers.

Operators planning a multi-zone room should map out their control runs before ordering accessories. The number of M12 to RJ11 cables needed equals the number of independent control zones — one cable per zone to bridge controller output to the first fixture. Daisy-chain cables between fixtures in a zone are a separate SKU. If you're building out a new room or retrofitting an existing one with Flexstar fixtures, confirm your controller's RJ11 port count and zone capacity to size your cable order correctly. HSC can assist with accessory planning as part of a full fixture quote.