Fractal Design Define One Light Solid ATX Mid-Tower Case
Fractal Design
Fractal Design Define One Light Solid ATX Mid-Tower Case
The Fractal Design Define One Light Solid is a mid-tower case designed for builders who prioritize quiet operation without sacrificing airflow or versatility. Its sound-dampened panels, three pre-installed fans, and tool-less build features make it suited to both gaming and productivity setups.
Why this product
Sound-dampened design
Bitumen-lined front and side panels reduce noise while the closed-front layout maintains acoustic isolation. Three Momentum 14 fans are pre-installed for immediate quiet airflow.
Tool-less assembly
Removable fan brackets, tool-free top and front panels, and quick-access PSU bracket make building intuitive. Cable management aids including straps, aligners, and routing grommets keep the interior tidy.
Fits high-end graphics cards
Accommodates GPUs up to 368 mm long with an integrated air guide and support bracket. Supports CPU coolers up to 185 mm tall and front radiators up to 360 mm.
Dual USB-C connectivity
Front I/O includes a 20 Gbps USB Type-C port alongside two USB Type-A ports and audio combo jack for modern peripherals.
Scandinavian aesthetic
Architectural curvature and fine-patterned aluminum side vents create a refined look that fits home environments as well as gaming setups.
- ColorWhite
- Form factorATX Mid-Tower
- Pre-installed fans3× Momentum 14
- Max GPU length368 mm
- Drive bays2× 2.5″ + 2× 3.5″/2.5″
- Expansion slots7
- Front USB Type-C20 Gbps
- SKUFRA-5872
- EAN7340172714736
- Supports ATX, EATX, and Mini-ITX motherboards, offering flexible platform choice.
- Accommodates PSUs up to 250 mm in length with a dedicated bracket and dust filter.
- Seven PCI expansion slots for graphics cards, capture cards, and other add-ons.
- Radiator support is limited to 360 mm on the front and 280 mm on the top; larger liquid cooling setups will not fit.
Best for
- Builders seeking quiet operation
- Gaming and productivity builds with high-end GPUs
- Systems prioritizing aesthetic integration with home spaces
- First-time builders who value ease of assembly
Trade-offs
- Extreme overclocking setups requiring maximum airflow and minimal sound dampening.
- Builds with radiators larger than 360 mm (front) or 280 mm (top).
- Systems requiring PSUs longer than 250 mm.
- Setups with GPUs exceeding 368 mm in length.
Define One combines refined Scandinavian design with versatile capability. With aluminum side intake vents, three pre-installed Momentum fans, and sound-dampening bitumen, it balances airflow and noise reduction for a harmonious experience.
Quieter by design
Enjoy a more harmonious gaming experience with a closed-front design and bitumen-lined front and side panels for sound dampening.
Refined expression
Integrate your setup naturally into your home with subtle architectural curvature and fine-patterned aluminum side intake vents.
Smooth building
Enjoy a smooth and intuitive build experience with tool-less access and removable top and front fan brackets for easier installation.
Powerful fans included
Keep your system running smoothly with three pre-installed LCP-blade Momentum 14 fans offering powerful out-of-the-box airflow.
Designed for versatility
Crafted for work and play with space for graphics cards up to 368 mm in length with an integrated GPU air guide and support bracket.
Accessible I/O
Connect your devices effortlessly with an I/O featuring a 20 Gbps USB Type-C port, two USB Type-A ports, and a combined audio jack.
Clean finish
Achieve a neat and tidy interior with cable straps, aligners, a routing grommet, and support for reverse connector motherboards.
General
| Brand | Fractal Design |
|---|---|
| Color | White |
| Form factor | ATX Mid-Tower |
Storage & compatibility
| Supported motherboards | Mini-ITX, ATX, EATX |
|---|---|
| Dedicated 2.5″ bays | 2 |
| Combined 3.5″/2.5″ bays | 2 |
| Expansion slots | 7 |
Cooling & dimensions
| Pre-installed fans | 3× Momentum 14 |
|---|---|
| Max GPU length | 368 mm |
| Max CPU cooler height | 185 mm |
| Max PSU length | 250 mm |
| Front radiator support | 360 mm |
| Top radiator support | 280 mm |
Connectivity & controls
| USB Type-C (front) | 1× 20 Gbps |
|---|---|
| USB Type-A (front) | 2× 5 Gbps |
| Audio jack | Combined Audio/Microphone |
| Power button | Yes |
Construction & features
| Front panel | Industrial steel |
|---|---|
| Side panels | Sound-damped steel |
| Tool-less access | Top panel, front panel, side panels, PSU bracket, PCI blanks, PSU filter |
| Dust filters | Front and PSU |
| Cable management | Straps, aligners, routing grommet |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.