10-foot dimming adapter between Flexstar M12 fixture ports and RJ-style controller inputs.
The Flexstar M12 to RJ12 Cable/B4 is a 10-foot adapter cable designed to connect Flexstar fixtures equipped with an M12 dimming connector to lighting controllers that use a standard 6-conductor RJ12 (6P6C) input port. It is the correct interface cable for integrating Flexstar commercial LED fixtures into a centralized dimming or environmental control system.
The Flexstar M12 to RJ12 Cable/B4 serves a single, clearly defined job: it bridges the M12 locking connector on a Flexstar LED fixture to the RJ12-format input port found on many commercial lighting controllers and environmental control systems. Without the correct adapter cable, the fixture's dimming port cannot communicate with an RJ-style controller, which means you lose the ability to dim, schedule, or automate that fixture from a central control point.
The M12 end is a keyed, locking connector that seats securely into the designated dimming port on compatible Flexstar fixtures. The RJ12 end (6-position, 6-conductor format) plugs directly into the controller's RJ-style lighting input. At 10 feet, this cable gives enough slack to reach a controller or daisy-chain junction without excess cable management overhead — appropriate for standard row spacing in most commercial canopy configurations.
This cable is a required accessory for any commercial operator running Flexstar LED fixtures with M12 dimming ports who wants to integrate those fixtures into a centralized controller — whether that's a standalone lighting controller with RJ-style ports or a broader environmental control platform. It is a replacement or expansion part: if you are commissioning a new room with Flexstar fixtures, adding fixtures to an existing controlled zone, or replacing a damaged cable mid-cycle, this is the part you need.
It is also the right part if you are switching controllers and your new controller uses an RJ12 input standard where your previous setup did not require an adapter. Licensed cannabis and hemp operators running multi-zone light control across veg, transition, and flower rooms frequently need several of these cables per zone — one per fixture, or per daisy-chain group depending on controller architecture. Confirm your controller's RJ input specification (RJ12 / 6P6C) before ordering.
In a typical commercial LED dimming installation, Flexstar fixtures are connected to a lighting controller via a signal cable that carries the 0–10V or equivalent dimming signal. The M12 connector on the fixture side is a locking, industrial-grade format that resists accidental disconnection — an important feature in a working grow environment where cables get bumped during IPM, harvesting, and training operations. The RJ12 end terminates at the controller's port, completing the control loop.
If your installation uses daisy-chaining, one cable runs from the controller to the first fixture; subsequent fixtures connect using compatible daisy-chain cables. The B4 designation identifies this cable's specific pin configuration and interface series within Flexstar's accessory lineup. Confirm compatibility with your specific Flexstar fixture model and controller before installation — different Flexstar fixture generations may use different port variants. Contact HSC for compatibility guidance before ordering.
This cable is stocked as a catalog accessory through Hydro Supply & Co. (SKU: 10-010704-381) and is available for order nationwide. It is a low-cost but operationally critical part — a missing or failed dimming cable in a controlled grow room means manual operation or no dimming at all until it is replaced. HSC maintains direct accounts with Flexstar, so lead times on accessory cables are typically short.
If you are unsure whether this is the correct cable for your fixture model and controller combination, reach out before ordering. Connector mismatches on dimming cables are a common source of installation delays. HSC can confirm compatibility based on your specific Flexstar fixture series and the controller make/model you are running.
| SKU | 10-010704-381 |
| Brand | Flexstar |
| Cable Length | 10 ft (approx. 3 m) |
| Fixture-Side Connector | M12 locking |
| Controller-Side Connector | RJ12 (6P6C) |
| Cable Series / Interface | B4 |
| Application | Dimming signal / lighting control interface |
| Compatible Fixture Side | Flexstar fixtures with M12 dimming port |
| Compatible Controller Side | Controllers with RJ12-format lighting input port |
The M12 end is an industrial locking connector that plugs directly into the M12 dimming port on compatible Flexstar LED fixtures. It locks in place to prevent accidental disconnection. The RJ12 end (6-position, 6-conductor) is a standard telephone-style jack format that is widely used on commercial grow light controllers for dimming signal input. This cable translates between those two connector standards.
The RJ12 end is a standard 6P6C format that is physically compatible with any controller using an RJ12 lighting input port. However, dimming protocols vary by controller manufacturer — verify that your controller uses a dimming signal standard (such as 0–10V) that is compatible with your Flexstar fixture's dimming spec. If you are unsure, contact HSC before ordering.
Ten feet provides enough reach for most standard row-mount configurations where the controller or daisy-chain junction point is located near the fixture string. If your controller is mounted at the end of a row or in a remote panel significantly farther away, you may need an extension cable. Contact HSC to discuss your layout if cable run length is a concern.
That depends on how your controller and fixtures are wired. In a daisy-chain setup, the M12-to-RJ12 cable typically runs from the controller to the first fixture in the chain; subsequent fixtures connect via fixture-to-fixture daisy-chain cables. In a home-run configuration, you would need one cable per fixture. Refer to your Flexstar fixture's wiring diagram and your controller's installation guide, or contact HSC for help mapping your specific layout.
B4 identifies the cable's interface series within Flexstar's accessory lineup — it specifies the pin configuration and connector variant for this particular adapter cable. It is important to match the correct cable series to your fixture model and controller. If you are replacing an existing cable, match the B4 designation; if you are purchasing for a new installation, confirm the required series with your fixture documentation or contact HSC.
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