Why Stairwell and Corridor Lighting Is Usually an Efficiency and Control Problem
Stairwells and utility corridors are high-runtime spaces with strict energy constraints. Many projects are limited by Lighting Power Density (LPD) targets and must still maintain safe, uniform illumination. Fixture selection is only half the decision; controls and distribution often determine whether the design passes energy review without under-lighting.
How Wraparound and Strip Lights Differ
| Fixture Type | Optical Behavior | Typical Result |
|---|---|---|
| Wraparound | Diffuse lens wraps sides; wider distribution | Smoother wall wash, fewer dark bands |
| Strip | More direct downward distribution | Higher efficiency and punch, more contrast |
Distribution and Uniformity in Narrow Spaces
Corridors and stairwells benefit from controlled lateral distribution. Wraparounds often reduce shadowing and improve perceived brightness on walls, which can allow lower wattage while maintaining comfort and safety perception.
| Space Condition | Better Default | Reason |
|---|---|---|
| Narrow corridor with many doors | Wraparound | Better side distribution improves facial recognition and visibility |
| Utility corridor with exposed piping | Strip | Higher efficiency; good downward task visibility |
| Stairwells with landings | Wraparound | Reduces harsh contrast and improves uniformity |
LPD Considerations and Control Strategies
If LPD is the constraint, the fastest savings typically come from controls and right-sized lumen packages, not from choosing the most aggressive optic.
- Use step-dimming or bi-level control for stairwells and long corridors
- Occupancy sensors reduce runtime dramatically in low-traffic utility corridors
- Selectable wattage fixtures should be set based on measured performance, not defaulted to max
Where Each Fixture Type Is the Better Choice
| Application | Preferred Fixture | Selection Reason |
|---|---|---|
| Public stairwell | Wraparound | Uniformity and reduced harsh glare |
| Back-of-house corridor | Strip | Efficiency and maintenance simplicity |
| Mechanical/utility run | Strip | Directional light for equipment visibility |
Common Mistakes in Stairwell Retrofits
- Over-lighting to “feel safe” instead of using bi-level controls
- Mounting strips where lateral distribution is needed, creating harsh shadows
- Ignoring lens glare; diffuse distribution is not always low-glare
- Setting selectable fixtures to max output by default and failing LPD targets
Related Linear and Corridor Lighting Categories
Wraparounds typically improve perceived uniformity and reduce contrast in stairwells and public corridors. Strip lights can be the better choice in utility corridors where efficiency, directional visibility, and simpler distribution are the priority. Under LPD limits, control strategy and correct lumen selection usually matter more than fixture form factor.
Brandon Waldrop
As the lead technical specialist for our commercial lighting technical operations, Brandon Waldrop brings over 20 years of industry experience in product specification, outside sales, and industrial lighting applications.
His career began in physical lighting showrooms, where he focused on hands-on product performance and technical support. He later transitioned into commercial outside sales, working directly with architects, electrical contractors, and facility managers to translate complex lighting requirements into energy-efficient, code-compliant solutions.
Today, Brandon applies that industry experience to architect high-performance digital catalogs and technical content systems, helping commercial partners streamline the specification process and deploy lighting solutions with total technical confidence.
