ROUND HARSH Series
Overview
The compact yet robust Round Harsh Series is engineered to perform in tight, demanding industrial environments, delivering up to 150 lumens per watt in a 9-inch form factor ideal for confined areas exposed to moisture, dust, salt spray, and vibration. It operates in ambient temperatures up to 140°F with over 127,000 hours of reliable light, and performs in extreme cold down to -40°F. Six lens options and seven mounting configurations, along with pre-installed cords and a universal 3/4-inch NPT mounting interface, provide flexible, simplified installation, backed by Red Sky Lighting's 10-year warranty.
Classifications, Ratings, Certifications
INFO
NEMA 4X High Bay LED for Harsh, Confined Industrial Spaces
Confined areas exposed to moisture, dust, and salt spray need a compact fixture rated for the punishment — the Round Harsh Series brings NEMA 4X protection to a 9-inch footprint.
The compact yet robust Round Harsh Series is engineered to perform in tight, demanding industrial environments. With a 9-inch form factor, it delivers up to 150 lumens per watt using high-efficiency LEDs — ideal for confined areas in facilities exposed to moisture, dust, salt spray, and vibration.
Built for durability, it operates in high ambient temperatures up to 140°F and delivers over 127,000 hours of reliable light at that temperature, with robust housing supporting performance in extreme cold as low as -40°F.
Key Features
- Flexible Installation: 7 different mounting options.
- Various Lens Options: 6 different lens options including polycarbonate diffuse drop lens
- Compact and Light Weight Design: 9-inch form factor.
- Quick Installation: 60 seconds installation time.
Why Specify the Round Harsh Series
- NEMA 4X rated for corrosive, wet, and confined industrial spaces
- 127,000-hour L70 life at 140°F ambient
- 60-second installation reduces labor cost
- 10-year warranty
Specs
| Electrical Parameters | |
|---|---|
| L70 | 127,000 hrs@140°F |
| Warranty | LEDs: 10 years, Driver: 7 years |
| Power Factor | ≥0.90 |
| Supply Wire | 12-18AWG, Rated 90°C |
| Surge Protection | 10KV |
| THD | <20% |
| Dimming | 0-10V, Range 10-100% |
| Power (W) | 35W | 40W | 45W | 55W | 60W | 65W |
| Rated Input Current @277V AC (A) | 35W (0.14) | 45W (0.18) | 55W (0.22) | 65W (0.26) |
| Rated Input Current @347V AC (A) | 40W (0.128) | 60W (0.192) |
| Rated Input Current @480V AC (A) | 40W (0.092) | 60W (0.138) |
| Rated Input Current @120V AC (A) | 35W (0.324) | 45W (0.416) | 55W (0.509) | 65W (0.601) |
| Frequency | 50/60Hz |
| Voltage (V AC) | 120-277 | 347-480 |
| Optical Parameters | |
|---|---|
| Correlated Color Temperature (CCT) | 3000K / 4000K / 5000K / Amber |
| Color Rendering Index (CRI) | 80 CRI Standard (70 CRI & 90 CRI optional, DLC available with 70 CRI only) |
| Available Beam Angle | 60° / 120° / T1 / T3 |
| Lumen Efficacy* | 150Lm/W |
| Lumen Output (Lm)* | 5048 | 5617 | 6532 | 7982 | 8901 | 9591 |
| Mechanical Parameters | |
|---|---|
| Hardware | 316 Stainless Steel |
| Lens Material | Tempered Glass / Polycarbonate |
| Mounting Options | Pendant, Ceiling, Yoke, Wall, Stanchion, Pole, Pipe, Junction box |
| Product Weight | 11.0lbs / 5.0kg |
| Housing Material | Die-cast aluminum |
| Package Weight | 13.1lbs / 6.0kg |
| Cable Entry | (5) 3/4" NPT |
| Product Dimensions (L×W×H) | 10.6 x 10.3 x 7.85in (269.4 x 262 x 199.3mm) |
| Package Dimensions (L×W×H) | 12.7 x 11.6 x 8.7in (323 x 295 x 220mm) |
| Environmental Parameters | |
|---|---|
| Ambient Operating Temperature | -40°F ~ +140°F (-40°C ~ 60°C) |
| EPA Wind Rating (FT2) | 0.929 (Yoke), 1.032 (Ceiling), 0.917 (Stanchion) |
* Value calculated based on 5000K, 80 CRI and clear glass; varies to different spec. 70 CRI & 90 CRI optional, DLC available with 70 CRI only.
Compliance
| Certifications |
|---|
| CSA C22.2 No. 250.0 |
| DLC Premium (See Notes) |
| FCC Part 15, Subpart B |
| UL 1598 |
| UL 1598 Wet Locations |
| UL 1598A |
| UL 1598A Marine Outside Type (Salt Water) |
| Ratings |
|---|
| 3G (ANSI C136.31) (See Notes) (Yoke Mount Only) |
| IK08 (Glass) |
| IK10 (PC) |
| IP66 |
| NEMA 4X |
| Salt Spray 720 hrs (ASTM B117) |
* Not all product variations are DLC qualified. Visit www.designlights.org/search to confirm qualification.
** Yoke Mount Only
Downloads
Spec Sheets
| Document Type | Description | Updated | Download |
|---|---|---|---|
| Specification | ROUND HARSH Series – Full Specification Sheet | 7/21/2026 |
IES
| Document Type | Description | Updated | Download |
|---|---|---|---|
| IES | ROUND HARSH Series – IES Photometric Data Files | 7/21/2026 |
Technical Documents (Installation Manuals)
| Document Type | Description | Updated | Download |
|---|---|---|---|
| Installation Manual | ROUND HARSH Series – Installation Manual | 7/21/2026 |
Marketing Materials
| Document Type | Description | Updated | Download |
|---|---|---|---|
| Brochure | Brochure - ATEX, IECEx, UKEX Certified Products | 7/21/2026 | |
| Brochure | Brochure - Built for Harsh Environments | 7/21/2026 | |
| Brochure | Brochure - Hazloc - UL Certified Products | 7/21/2026 | |
| Brochure | Brochure - Quick Selection Guide | 7/21/2026 | |
| Brand Kit | Red Sky Lighting Brand Guidelines and Logos | 7/21/2026 |