FLEXSTAR UNDER CANOPY 120W R5W

What It Is

The Flexstar UCL 120W R5W is a slim-profile, bar-format LED fixture purpose-built for under-canopy supplemental lighting in licensed cannabis and hemp facilities. At just under 46 inches long and 2.9 inches wide, it mounts horizontally beneath the primary canopy layer — between the toplight and the lower bud sites that dense foliage shades out.

The R5W spectral profile is a flowering-weighted output tuned to support bud development at canopy levels where primary fixtures deliver diminishing returns. The fixture runs at a flat 120W draw across the full 120V–277V input range, making it compatible with standard commercial infrastructure without additional electrical engineering.

Flexstar has manufactured commercial horticultural lighting since 2009 and the UCL line carries ETL, DLC, and CE certifications — the certifications required for utility rebate qualification in most U.S. states.

Who It's For

Any licensed operator running dense, multi-tier canopies where lower bud sites are underdeveloped, removed at harvest, or flagged in yield audits is the core buyer. This applies to single-tier rooms with thick canopy screens (ScrOG, heavy LST) as well as multi-tier vertical stacks where inter-tier spacing limits light angle from the tier above.

Vertical grow facilities are a particularly strong fit: the UCL mounts above or below canopy interchangeably, so it works both as a dedicated under-canopy supplemental unit and as a modular primary fixture in shallow-tier vertical builds where a full-wattage toplight won't physically clear the structure.

Operators running 0–10V controller infrastructure — including Flexstar's own Zeus controller — can integrate the UCL directly into existing dimming and scheduling systems via the RJ11 connection port on each fixture.

Key Features

Daisy-chain connectivity via seamless end-to-end snap connection allows up to 17 fixtures per run from a single power cord, reducing electrical drops and installation time across long rows. The 120° beam angle spreads output laterally for broad, even coverage across mid-canopy rather than punching straight down.

Passive cooling — no fans, no moving parts — means zero additional heat load at canopy level and no mechanical failure points. The IP66 rating (fully dust-tight, protected against high-pressure water jets) makes the fixture appropriate for environments with regular washdown protocols.

Dimming is 0–10V with a 40–100% range, including an OFF position, giving cultivation teams full control over DLI contribution from supplemental lighting independent of the primary fixture layer. Rated lifetime is L90 greater than 50,000 hours — meaning the fixture maintains 90% or more of original output for the rated lifespan.

DLC listing enables licensed facilities in participating utility territories to submit the UCL for energy rebate programs, which can materially reduce net fixture cost at scale. Rebate availability varies by utility and region.

How It Fits a Commercial Build

In a single-tier flowering room, the UCL is positioned beneath the canopy screen — typically 6 to 18 inches below the primary toplight plane — directed downward into the lower bud zone. The 120° distribution prevents hot spots and provides lateral overlap when fixtures are spaced at standard row intervals.

In vertical multi-tier racking, the UCL typically mounts to the underside of each tier's grow deck, pointing downward at the tier below. This eliminates the inter-tier shadow created by the deck structure itself and is especially effective in 4-tier and 5-tier configurations where upper tiers block meaningful light from reaching lower levels.

For facilities running Flexstar Zeus controllers, the UCL integrates natively — same dimming protocol, same cabling standard — so supplemental zones can be programmed and ramped independently of the toplight layer without additional control hardware. Fixtures can also be controlled via any third-party 0–10V dimming system.