Keystone KT-MSLED44PS XFit Color & Power Select 4ft LED Microstrip Fixture — 44W/28W/18W Selectable — 3500K/4000K/5000K — White / Frosted PMMA Lens

The Keystone KT-MSLED44PS-4-8CSA-VDIM is a commercial 4ft XFit LED Microstrip Fixture engineered to deliver up to 5,896 lumens with field-adjustable 44W/28W/18W Power Select settings (multi-wattage selectable driver, field-adjustable lumen output, variable power settings) and switchable 3500K/4000K/5000K Color Select temperatures (field-adjustable CCT, color temperature selectable, tunable white, switchable Kelvin). Operating on 120–277V electrical systems with 0–10V continuous dimming, this luminaire combines a compact 2.36-inch wide post-painted steel body with a frosted PMMA lens for uniform illumination across commercial, retail, and residential strip applications. Built with a cULus / UL 1598 Dry and Damp Location rating, it is qualified for utility rebates under DLC Listed standards and features an integrated 1/2" knockout port for modular occupancy sensors and SmartLoop wireless controls.

Key Features

• Selectable Wattage: 44W/28W/18W — field-adjustable via onboard Power Select switch (multi-wattage selectable driver / variable power settings; preset to 44W)
• Maximum Lumen Output: 5,896 lm at 44W / 5000K
• Peak Efficacy: Up to 144 lm/W for high-efficiency commercial operation
• CRI: >80 color rendering across all settings (ANSI C78.377-2017 color uniformity)
• Selectable CCT: 3500K/4000K/5000K — field-adjustable via onboard Color Select switch (color temperature selectable / tunable white / switchable Kelvin; preset to 5000K)
• Lens & Optics: Frosted PMMA lens for uniform, glare-free distribution
• Dimming: 0–10V continuous dimming standard with 12V auxiliary sensor tap
• Voltage: Universal 120–277V AC, 50/60Hz constant current driver
• Location Rating: cULus / UL Listed 1598 for dry and damp locations; suitable for installation within clothes closet storage spaces
• Operating Temperature: -4°F (-20°C) to 122°F (50°C) ambient range
• Certifications: DLC Listed, cULus / UL Listed 1598, NLB Trusted Warranty Program verified
• Rated Life: L70 >100,000 hours LED lifetime @ 77°F (25°C) ambient (50,000-hour rated luminaire specification table life)
• Warranty: 10-year limited warranty — Keystone Technologies
• Form Factor & Design: Compact 2.36" wide post-painted steel microstrip profile supporting surface, V-hook chain, and linked continuous-row mounting

Performance & Light Output

At 44W: 5,808 lm (3500K / 132 lm/W), 5,852 lm (4000K / 133 lm/W), 5,896 lm (5000K / 134 lm/W).

At 28W: 3,892 lm (3500K / 139 lm/W), 3,920 lm (4000K / 140 lm/W), 3,948 lm (5000K / 141 lm/W).

At 18W: 2,556 lm (3500K / 142 lm/W), 2,574 lm (4000K / 143 lm/W), 2,592 lm (5000K / 144 lm/W).

CRI >80 across all configurations. Rated life L70 >100,000 hours (50,000-hour rated luminaire specification table life) per IES TM-21 testing.

Form Factor & Design Profile

Engineered with a sleek 2.36-inch width, the 4ft XFit LED Microstrip provides a compact architectural footprint for surface-mounted or suspended commercial, retail, and residential strip applications. End-plate 1/2" knockouts accommodate optional end-to-end surface linking brackets (KT-MSLED-LSM-KIT) and modular occupancy sensors.

Smart & Control Features

The KT-MSLED44PS microstrip features an internal Keystone 0–10V dimming driver with 12V auxiliary leads and a standard 1/2" knockout port supporting modular sensing and wireless automation:

• 0–10V Continuous Dimming (Standard): Dims smoothly on standard 0–10V low-voltage control circuits (purple 0–10V+ and pink 0–10V- leads). Compatible with commercial dimmers and centralized building automation systems (BAS).
• Keystone SmartLoop Bluetooth Mesh & Occupancy Sensors (Accessory): Compatible with factory- or field-installable PIR, microwave, and SmartLoop Bluetooth mesh controllers for group control, daylight harvesting, and bi-level occupancy dimming.

Compatible sensors and controllers include High Bay PIR Motion Sensor KTS-PIR2-UV-KO (suffix /PIR, 120–347V, 1/2" KO mount), Microwave Bi-Level Sensor Kit KTS-MW3-UV-KO-K2 (suffix /MW, IP65 12V sensor head with 120–277V converter, 1/2" KO mount), SmartLoop Low-Voltage Bluetooth Mesh PIR Controller KTSL-FC2-12V-SM-PIR (suffix /FC2, 12V, installs with bracket KT-MSLED-SLB-1), and Bluetooth Mesh High-Voltage PIR Controller KTSL-HBFC1-UV-KO-PIR (suffix /HBFC1, 120–277V) — all sold separately.

Electrical

Powered by a Keystone 0–10V dimming LED driver operating on 120–277V AC input. Delivers high electrical efficiency with a Power Factor >0.95 (>0.90 specification table minimum) and Total Harmonic Distortion (THD) <20%. Includes pre-wired 0–10V dimming leads (purple/pink) and 12V DC auxiliary leads (yellow/brown) for low-voltage sensor integration.

Emergency Battery Backup: Compatible with Keystone SmartSafe LED emergency backup drivers (factory- or field-installable, sold separately) to provide 90 minutes of standby illumination during a primary power failure, including 5W constant-wattage backup KT-EMRG-LED-5C-500-SEN (suffix /EM5, ~500 lumens, CEC T20 compliant) and 12W remote compact backup KT-EMRG-LED-12C-1200 (suffix /EM12, ~1,200 lumens, CEC T20 compliant).

Construction

Housing & Thermal: Post-painted steel body engineered for durability and passive thermal dissipation.

Lens & Optics: Frosted PMMA lens engineered for smooth, uniform, glare-controlled illumination.

Finish: White post-painted finish formulated for resistance against corrosion and surface wear.

Environmental Sealing: cULus / UL Listed 1598 for dry and damp locations; suitable for installation within clothes closet storage spaces. Operating ambient temperature range: -4°F (-20°C) to 122°F (50°C).

Dimensions & Weight: 47.32" L × 2.36" W × 2.65" H.

Installation & Mounting

Standard Mounting: Designed for direct surface mounting or suspended chain mounting using the optional V-hook and chain kit.

Continuous Run Mounting: Supports end-to-end continuous row mounting using the optional linking surface mount bracket and knockout grommet kit.

Accessories (Sold Separately):

• Mounts & Brackets: KT-MSLED-VH-KIT (V-hook and 40" chain kit, pair), KT-MSLED-LSM-KIT (linking surface mount end-to-end metal bracket and KO grommet), KT-MSLED-SLB-1 (microstrip bracket for SmartLoop KTSL-FC2-12V-SM-PIR sensor) — sold separately
• Sensors & Controls: KTS-PIR2-UV-KO (PIR motion sensor, suffix /PIR), KTS-MW3-UV-KO-K2 (microwave bi-level sensor kit, suffix /MW), KTSL-FC2-12V-SM-PIR (SmartLoop 12V Bluetooth mesh PIR controller, suffix /FC2), KTSL-HBFC1-UV-KO-PIR (SmartLoop 120–277V PIR controller) — sold separately
• Cord Sets (Factory- or Field-Installable): KT-CS-515P-6-18/3 (6' 125V NEMA 5-15P straight plug), KT-CS-L715P-10-16/3 & KT-CS-L715P-6-16/3 (10' & 6' 277V NEMA L7-15P twist-lock), KT-CS-L615P-10-16/3 & KT-CS-L615P-6-16/3 (10' & 6' 250V NEMA L6-15P twist-lock), KT-CS-L515P-10-16/3 & KT-CS-L515P-6-16/3 (10' & 6' 125V NEMA L5-15P twist-lock), KT-CS-NP-6-16/3, KT-CS-NP-10-16/3 & KT-CS-NP-15-16/3 (6', 10', & 15' 16/3 SJTOW blunt-cut cords, no plug) — sold separately
• Emergency Battery Backups: KT-EMRG-LED-5C-500-SEN (5W, ~500 lm, 90-min CEC T20 compliant, suffix /EM5), KT-EMRG-LED-12C-1200 (12W, ~1,200 lm, 90-min CEC T20 compliant, suffix /EM12) — sold separately

Certifications & Rebates

• DLC Listed: Qualifies for commercial utility rebate incentives across regional energy efficiency programs. To confirm rebate eligibility with your local utility provider, visit designlights.org and search DLC Product ID PFPBU4KQ (S-WVQ2X8).
• cULus / UL Listed 1598: cULus / UL Listed 1598 for dry and damp locations; suitable for installation within clothes closet storage spaces.
• ANSI C78.377-2017: Meets correlated color temperature (CCT) uniformity guidelines.
• NLB Trusted: Verified under the National Lighting Bureau Trusted Warranty Program (10-year limited warranty).

Typical Applications

• Commercial Utility & Back-of-House Corridors — Field-adjustable 44W/28W/18W Power Select output and 3500K/4000K/5000K CCT adapt to varying ceiling heights and ambient light requirements
• Retail Aisle & Display Cove Lighting — Compact 2.36-inch wide post-painted steel housing with frosted PMMA lens provides clean, uniform linear illumination
• Warehouses, Workshops & Task Stations — High-efficiency operation up to 144 lm/W (5,896 peak lumens) and optional 1/2" knockout PIR/microwave sensors reduce energy consumption
• Stairwells, Basements & Storage Areas — UL 1598 damp location rating and clothes closet storage space suitability provide code-compliant commercial and residential strip illumination
• Educational & Office Support Spaces — 0–10V continuous dimming driver with 12V aux tap supports seamless integration with Keystone SmartLoop Bluetooth mesh wireless controls

What's Included

• Keystone KT-MSLED44PS-4-8CSA-VDIM 4ft XFit LED Microstrip Fixture — White
• Installation and wiring instructions