The narrow 1.5-inch aperture recessed linear slot LED luminaire is a versatile lighting solution designed to integrate seamlessly into ceilings or walls, offering a clean and unobtrusive architectural aesthetic. Crafted from extruded aluminum, the luminaire is available in individual units or continuous runs in one-inch increments, accommodating a variety of ceiling configurations and application requirements. Frosted acrylic lenses provide smooth, uninterrupted illumination without visible pixels or shadows, while multiple lens options—including Asymmetric, Batwing, Flush, and 0.5-inch Pop-Down—allow designers to optimize visual comfort, uniformity, and brightness control. Point source options and adjustable output levels offer additional flexibility, with beam spreads ranging from narrow to wide to suit different spaces and lighting needs. The system is PoE compatible, enabling integration with Power over Ethernet lighting networks via low-voltage wiring.
Performance is engineered for precision, with proprietary linear LED boards that create continuous, seamless lines of light. LED placement and lens materials are optimized to achieve the ideal balance between high performance and visual comfort. The luminaire supports both direct and indirect illumination, and individual control of lensed and point sources allows precise lighting design for work planes, walls, and ceilings. Its narrow 1.5-inch profile ensures the fixture remains unobtrusive while making a refined aesthetic statement in commercial interiors such as conference rooms, offices, reception areas, and other professional spaces.
Constructed with durability in mind, the luminaire features a one-piece extruded aluminum housing with 20-gauge steel end caps. It is suitable for new construction applications and can be used with standard or specialty ceiling systems, including mud-in trimless, hard surface, and wood ceilings. The 8-foot units weigh approximately 15 pounds and can be specified for continuous runs or custom patterns, including L, U, or rectangular configurations. Reflectors are fabricated from 22-gauge steel with a high-reflectance white powder coat finish, and extruded acrylic lenses up to eight feet long maintain consistent frosted illumination. Recommended placement for the Asymmetric lens is 15 to 30 inches from walls to optimize light distribution.
The luminaire’s LED system employs premium diodes on a robust platform to ensure uniform illumination and superior thermal management. Available color temperatures include 3000K, 3500K, and 4000K with 80 and 90 CRI options. The higher CRI 3500K and 4000K configurations achieve a cyanosis observation index (COI) of 3.3 or less, ensuring accurate color rendering in sensitive environments. LED modules and drivers are replaceable from below, with color consistency maintained at <3 SDCM. Lumen maintenance is exceptional, with lensed sources achieving reported L70 at over 61,000 hours and calculated L70 up to 470,000 hours, ensuring long-term performance.
Electrical integration is straightforward, with factory-installed branch circuit wiring, over-molded quick connects, and a standard 120-277V constant current driver featuring 0-10V analog dimming. The luminaire has a power factor greater than 0.9 and supports advanced control options, including Lutron Hi-Lume EcoSystem and DALI 1% dimming. Low-voltage PoE systems are also compatible, although PoE installations require an independent node and power feed for each luminaire section. Emergency operation is supported with a 10-watt battery providing 90 minutes of output, and the luminaire is UL and cUL listed for dry or damp locations.
A wide range of lumen outputs is available, from 125 to 625 lumens per foot, with minimum lengths varying depending on output and control options. Direct and indirect distributions allow for flexible design, and multiple circuits can be specified for independent control of direct and indirect sources. Standard matte white housing is available, with factory finishes applied using polyester powder coat over a multi-stage pre-treatment for durability. Optional factory configurations include daylight circuits, emergency circuits, emergency battery packs, emergency control devices, Chicago plenum, and New York City flex whips for compliance with regional codes.
Overall, this narrow 1.5-inch recessed linear slot LED luminaire combines high performance, design flexibility, and visual comfort in a compact, unobtrusive profile. Its continuous illumination, versatile lens options, and compatibility with PoE or advanced dimming systems make it an ideal choice for commercial, professional, and architectural applications where both aesthetics and precise lighting performance are paramount.
https://www.focalpointlights.com/products/recessed-linear/seem-1-recessed-fsm1
