How to Assess and Replace Legacy Lighting in Data Centers: A Technical Guide for 2025

1. What Is Legacy Lighting in Data Centers?

Legacy lighting includes older lighting types such as:

• Fluorescent tubes (T8/T12)
• HID (High-Intensity Discharge) fixtures
• First-generation LED fixtures with poor LM-80/TM-21 performance

These systems often remain in data centers built before 2015. They’re energy-inefficient, degrade quickly, and strain cooling systems.

2. Why Should You Assess Your Data Center Lighting?

• Lighting contributes up to 10% of energy bills in some facilities
• Adds heat load, increasing cooling demand
• Poor visibility increases operational risk and errors
• Outdated systems may not meet NFPA or ASHRAE guidelines

This is not just about saving energy—it’s about improving uptime and compliance.

3. How to Prepare for a Lighting Audit

• Align teams: Bring in facilities, IT, finance, safety compliance
• Gather documentation: layout drawings, schedules, schematics
• Inventory lighting: type, location, usage, condition
• Set targets: desired lux levels, energy savings, ROI period

Create a shared document to track:

| Location        | Fixture Type | Wattage | Install Year | Notes              |
|----------------|--------------|---------|--------------|--------------------|
| Cold Aisle 1    | T8 Fixture   | 96W     | 2012         | Yellowing lenses   |
| Backup Server   | CFL Fixture  | 42W     | 2010         | Buzzing, dim       |

4. What to Look for During a Site Audit

• Measure light levels in hot/cold aisles, corridors, ingress areas
• Check control systems (occupancy sensors, daylight dimming, manual overrides)
• Use an energy meter to monitor circuit loads
• Note lumen degradation, yellowing diffusers, broken sensors

Compare readings to standards:

| Zone             | Recommended Lux | Measured Lux | Notes                 |
|------------------|-----------------|--------------|------------------------|
| Server Hallway   | 300 lx          | 180 lx       | Needs upgrade         |
| UPS Room         | 500 lx          | 470 lx       | Acceptable            |
| Office Support   | 350 lx          | 100 lx       | Inadequate for tasks  |

5. Interpreting the Data Collected

• Identify energy hogs (older fixtures using 3x the wattage of modern LEDs)
• Pinpoint uneven lighting (shadows = risks)
• Map cooling load impact from lighting wattage
• Estimate lighting power density (LPD) per room

If LPD > 1.0 W/ft² in server halls, it’s a flag.

6. Retrofit Options: Practical, Not Theoretical

• Retrofit with Squarebeam Elite for high-ceiling, high-temp areas
• Use SeamLine Batten in low-profile cable zones
• Add motion sensors or integrate DALI/Smart controls
• Use Budget High Bay to replace failing warehouse lights

7. Compliance and Safety Standards

• NFPA 101 and OSHA emergency lighting
• ASHRAE 90.1 Lighting Power Allowance
• IES Guidelines for glare, CRI, UGR
• LM-80 & TM-21 for lumen maintenance of LEDs

Useful resource: Lighting Best Practices for Data Centers

8. Calculating ROI and Business Case

Annual Savings ($) = (Old Watts - New Watts) × Hours/Year × $/kWh

Example:

• 500W reduced to 200W
• 8,000 hours/year
• $0.12 per kWh
• = $288/year per fixture. Multiply by quantity.

Also consider:

• Cooling load reduction
• Lamp replacement labor & costs
• Utility rebates

Frequently Asked Questions

Q: How often should lighting be re-assessed in data centers?
Every 5 years or after major infrastructure changes.

Q: Can I retrofit without disrupting server operation?
Yes. Phased retrofits or aisle-by-aisle strategies work well.

Q: Are rebates available for LED upgrades?
In most regions, yes—contact your local utility provider.

Q: Does lighting affect my cooling budget that much?
Absolutely. Every watt of lighting often adds 0.5–0.7 watts of cooling load.

Q: Can smart lighting tie into DCIM systems?
Yes. Many DALI/BACnet/Modbus lighting systems integrate with modern BMS/DCIM platforms.