Sylvania 63426 4 in Round Flame Resistant Slim Microdisk LED Downlight — 10W / 800 lm / Selectable CCT / 120V / White

The Sylvania 63426 (LEDMD4R3B800ST9SC3WH) is a 4 in round flame-resistant slim microdisk LED canless downlight from the LEDVANCE Performance Class family. At just 1/2 in height, it installs directly under joists in new and remodel construction. Delivering 800 lm at 10W (80 LPW), fire rated per UL263 (1100°C for 2 hours), IC rated, airtight per ASTM E283-2004, wet rated, and ENERGY STAR certified. Field-selectable CCT (2700K–5000K) via switch on remote driver. Quick connectors included. 120V / Phase-Cut dimming. TAA compliant. Ideal for multi-family housing and shipbuilding applications.

Key Features

• Type: 4 in round flame-resistant slim microdisk LED canless downlight | LEDVANCE Performance Class | Catalog: LEDMD4R3B800ST9SC3WH
• Construction: Ultra-thin 1/2 in height | Installs directly under joists | Quick connectors included | Universal Metal Frame sold separately for new construction
• Wattage: 10W | Replaces 100W BR40 (92% energy savings) | Replaces 120W incandescent (90% savings)
• Light Output: 800 lm
• Efficacy: 80 LPW (up to 86 LPW across family)
• Field-Selectable CCT: 2700K / 3000K / 3500K / 4000K / 5000K via switch on driver
• CRI: 92
• Input Voltage: 120V | Phase-Cut dimming | PF: >0.9 | THD: <20% | 120V only (for 120-277V / 0-10V: see Sylvania 63594, MTO)
• IC Rating: Yes — IC rated for direct contact with ceiling insulation
• Air Tight: Yes — certified per ASTM E283-2004
• Fire Rating: UL263 — withstands flames of 1100°C for up to 2 hours
• Environment: Wet rated | Op temp: -4°F to 104°F (-20°C to 40°C)
• Cable: FT6 listed cable
• Mounting: 4 in ceiling cut-out | 1/2 in fixture height | Fits under joists
• Closet Rating: Suitable for use in closets — NFPA 70, NEC section 410.16 (A)(3) and 410.16 (C)(5)
• Lifespan: 50,000 hours L70 | Warranty: 5-year / NLB Trusted Warranty Program
• Certifications: ENERGY STAR Certified | Title 24 Compliant | TAA Compliant | cETLus | FCC | RoHS | UL263 (fire rated) | ASTM E283-2004 (airtight)

Light Output & Performance

The Sylvania 63426 delivers 800 lm at 10W (80 LPW) with a CRI of 92, replacing a 100W BR40 at 92% energy savings. Field-selectable CCT (2700K–5000K) allows a single SKU to serve multiple lighting applications. L70 rated lifespan is 50,000 hours.

Electrical & Installation

The Sylvania 63426 operates at 120V with Phase-Cut dimming (PF >0.9, THD <20%). The ultra-thin 1/2 in profile installs directly under joists through a 4 in ceiling cut-out. Remote driver with quick connectors is included. IC rated and airtight per ASTM E283-2004. Fire rated per UL263 (1100°C / 2 hours). FT6 listed cable. For 120-277V or 0-10V dimming, see Sylvania 63594 (made to order).

Compatible Accessories (Sold Separately)

• Extension Cables: Sylvania 60793 — LEDMD6FTEXCBL (6 ft) | Sylvania 60794 — LEDMD10FTEXCBL (10 ft) | Sylvania 60795 — LEDMD20FTEXCBL (20 ft)
• Universal Metal Frames: Sylvania 62959 — LEDSLIMMDFRAME (20.72 × 9.65 in) | Sylvania 63743 — MDFRAME1A (17.72 × 14.65 in)

Typical Applications

• Multi-family housing and fire-rated ceiling applications
• Shipbuilding and marine applications
• Residential kitchens, bathrooms, and living areas
• Commercial offices and retail spaces
• Wet and damp locations including bathrooms and covered outdoor areas
• New construction and remodel installations under joists
• Closet lighting per NEC 410.16

What’s Included

• Sylvania 63426 4 in round flame-resistant slim microdisk LED downlight (white)
• Remote driver with quick connectors