The 4" MRI and imaging suite LED downlight is a sealed, recessed fixture available with either a round or square aperture. It offers flexibility with regressed or flush lensed trim options, allowing the light output to be tailored for specific design and functional requirements. The downlight is specifically built for MRI applications, featuring non-ferrous construction and RF-free electronics to ensure safe operation near sensitive imaging equipment. Lumen output ranges from 816 to 1,235 lumens, while dimming is available down to 1% using standard 0–10V control, including dim-to-dark capabilities, providing precise lighting adjustment for specialized medical environments. These fixtures are ideal for MRI imaging suites and other sensitive medical areas.
Electrically, the LED array is offered in multiple correlated color temperature (CCT) and color rendering index (CRI) combinations, with a maximum three-step MacAdam variation allowance for consistent color performance. The luminaire operates on a 24VDC input sourced from a remotely located 120–277VAC, high-power-factor power supply with an EMI filter. If dimming is required, a line EMI filter is necessary to maintain RF compliance in MRI rooms. The light engine and internal driver are serviceable and replaceable after installation, ensuring long-term usability.
Thermal management is achieved through a die-cast aluminum heatsink with external radial fins that facilitate natural convection cooling. This design maintains optimal operating temperatures and ensures reliable performance over the life of the fixture. The housing section is IP-rated and incorporates the heat sink, LED module, optics, and lower trim. It can be configured with either a regressed or flush lens trim, which is attached to the rough-in frame using hidden torsion springs. Closed-cell gasketing at the ceiling flange and an antimicrobial finish on all exposed painted surfaces help maintain hygiene in medical settings.
Optically, the downlight features a diffused tempered-glass upper lens and is available with various reflector distribution patterns and finishes. Flush lens trim options include a clear impact-resistant acrylic lens, allowing for customizable visual appearance while maintaining functional performance. Photometric testing has been conducted to the IESNA LM-79-08 standard by an ILAC/ISO17025 accredited laboratory, ensuring reliable light output and distribution.
The rough-in frame is fabricated from die-formed aluminum and includes a vertically adjustable collar that accommodates ceiling thicknesses up to 2". Adjustable mounting bars support installation in wood or metal frame joists as well as T-grid ceiling systems spaced up to 24" on-center. The junction box remains accessible post-installation from above or below the ceiling and features seven 1/2" knockouts to simplify wiring. This combination of flexible installation, robust construction, and MRI-safe design makes the 4" MRI LED downlight suitable for demanding medical imaging environments where performance, safety, and sanitation are critical.
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