In the grocery retail world, energy efficiency isn’t just a backroom metric—it’s a frontline priority. While traditional lighting systems often emphasize brightness and visibility, they can inadvertently increase the thermal burden on refrigerated cases.
To address this, many supermarkets are now conducting store-level energy trials comparing traditional LEDs with spectrum-controlled LED systems like Promolux’s SafeSpectrum™. These trials reveal measurable differences—not just in product freshness but also in energy savings, compressor workload, and long-term ROI.
Why Lighting Impacts Energy Efficiency
Most retailers assume that LEDs are energy-efficient by default, and while that’s partially true, it’s not the whole story.
- Standard LEDs:
- Emit intense light across a broad spectrum, including blue and UV wavelengths.
- Add unwanted heat inside refrigerated cases.
- Increase case temperature, triggering longer compressor runtimes.
- Spectrum-controlled LEDs (like SafeSpectrum™):
- Filter out harsh wavelengths.
- Minimize internal case heating.
- Preserve food quality and reduce compressor load.
Objective of Store-Level Energy Trials:
The purpose of these field trials is to answer one key question:
Can spectrum-controlled LEDs reduce refrigeration energy use without compromising merchandising appeal?
To measure this, retailers typically compare two similar cases in real store environments:
Case A: Standard LED lighting
SafeSpectrum™ LED lighting
Over the course of several weeks, they monitor variables such as:
- Energy consumption (kWh)
- Case interior temperature
- Compressor cycle frequency
- Product condition and shrink rate
What Trials Reveal: Key Findings
Here’s what store-level trials across North America have shown:
- Reduced Energy Consumption: Cases lit with SafeSpectrum™ LEDs required up to 12–18% less electricity than those using standard LEDs.
Why? Lower light-generated heat reduces compressor workload. - More Stable Case Temperatures: SafeSpectrum™ reduces internal warming, especially during long open hours. Trials showed more consistent temperature hold, even during restocking or high foot traffic.
- Fewer Compressor Cycles: Compressor systems in SafeSpectrum™ cases cycled 15–25% less frequently, reducing wear and extending lifespan.
- Better Product Integrity: Products in spectrum-controlled cases:
- Retained natural color longer
- Showed less dehydration
- Had lower shrink rates
Sample Trial Setup: Midwest Grocery Chain
- A trial conducted by a Midwest grocery chain compared two meat cases over 30 days.
- Both cases held similar SKUs of beef and poultry.
- Ambient store conditions were controlled and measured daily.
Only variable: type of lighting.
Results:
- Compressor runtime: ↓ 21% with SafeSpectrum™
- Display temperature variance: ↓ 1.8°C
- Product markdowns: ↓ 28% in spectrum-controlled case
Customer complaints about freshness: None in SafeSpectrum™ case
Energy Implications for the Whole Store
Let’s zoom out. A single case might only save a few kWh daily. But multiply that across:
- 10+ cases per department
- 6+ departments per store
- 100+ stores in a chain
Even conservative savings of 5–10% per case translate into tens of thousands of dollars annually in energy bills.
Retailer Feedback
> “Switching to SafeSpectrum™ LEDs cut our case temps by almost 2°C without adjusting the thermostat.
— Store Energy Manager, Western Canada
> “We didn’t expect lighting to make this big of a difference. Food looks better, lasts longer, and we’re saving on electricity.”
— Regional Facilities Director, USA
Trial Implementation Tips
Want to run your own in-store trial? Here’s how:
- Choose matched case types and products: Use identical refrigeration units with similar product loads.
- Monitor over a 2–4 week period: Track energy use, temperatures, and compressor cycles daily.
- Use data loggers and sensors: Tools like temperature probes and smart plugs offer precise readings.
- Control for external variables: Ensure the same restocking schedule, ambient store temp, and foot traffic patterns.
Beyond Energy: Sustainability Advantages
SafeSpectrum™ LEDs don’t just save energy—they:
- Reduce food waste via extended shelf life
- Reduce compressor wear and maintenance
- Improve cold chain integrity
- Contribute to store-level ESG and LEED goals
Final Thoughts
If your grocery chain is still using standard lighting in refrigerated cases, you’re missing out on both energy savings and food quality improvements. Store-level energy trials prove that switching to spectrum-controlled lighting isn’t just about better visuals—it’s a true operational upgrade. Learn more or start your own store-level trial at: www.energy-savings-refrigeration.com Footnotes- Promolux Technical Archive. Comparative energy trials conducted in U.S. and Canada, 2021–2023. Data on file.
- Store Energy Audits. Midwest Grocery Chain Internal Report, 2023. Energy efficiency data collected using third-party monitoring s
