RT8 Volumetric Recessed Lighting

2RT8S and RT8B are designed for applications that require the extremely energy efficient delivery of comfortable volumetric light from a lay-in fixture that is appealing and shallow in depth and where room-side ballast access is required. Ideal for offices, schools, hospitals and numerous other commercial applications.


2RT8S: Rugged, steel reflectors with embossed facets. Painted after fabrication. Door frame hinges from either side. Fixtures may be mounted end-to-end.

RT8B: Impact-modified acrylic prismatic refractor. One-piece, vacuum-formed PETE (poly-ethylene) trim with embossed facets.


Delivers volumetric lighting by filling the entire volume of space with light, providing the ideal amount to walls, cubicles, work surfaces and people.

Luminous characteristics are carefully managed at high angles, distributing just enough intensity to deliver the volumetric effect.

2RT8S: 98% reflective Alanod MIRO® silver optical assembly efficiently redirects lamp output to the refractor.

Regressed refractive system obscures and softens the lamp and smoothly washes the reflector with light.

Linear faceted reflector softens and distributes light into the space and minimizes the luminance ratio between the fixture and the ceiling.

Mechanical cut-off across the reflector and fresnel refraction along the refractor provide high angle shielding and a quiet ceiling.

Sloped endplates provide a balanced fixture to ceiling ratio while enhancing the perception of fixture depth.


Standard or high-efficiency, CEE premium, instant start, =10% THD, universal voltage and sound rated A are available as quick ship items.

Optional program-start and step-dimming ballasts available.

Product overview and specifications
Brand Name Lithonia Lighting
Color White
Color Rendering Index 80
Correlated Color Temperature 3500 K
Environment Indoor
Finish Gloss
Light Source Fluorescent
Listings CSA, UL
Mounting Type Surface, Recessed
Product Type Troffer
Series 2RT8S, 2RT8SX, RT8B, RT8BX
Shape Rectangular
Voltage Rating 120, 277, 347, MVOLT
Spec Sheets
A summary of the performance and other technical characteristics of the product.
File Type Document Title View
2RT8S-2X2_pdf View
2RT8S-2X4_pdf View
RT8B-1X4_pdf View
RT8BX-1X4_pdf View
Technical Files
Installation documents, building information models, etc.
File Type Document Title View
Acrylic-Polycarbonate-Compatibility_pdf View
Download brochures, sell sheets, photometry files and other sales tools.
File Type Document Title View
RT5B-RT8B-FAQs_pdf View