Why DC-Powered Lighting Instead of PoE Lighting?
Why do I talk about DC-powered lighting instead of PoE lighting?
Because DC-powered lighting is the destination. PoE is only one possible path.
One of the most common assumptions I encounter is that when someone advocates for DC-powered lighting, they must be talking about Power over Ethernet. That assumption made sense when PoE was one of the first widely adopted approaches for delivering low-voltage DC power to LED fixtures. But it can inadvertently narrow the conversation before we’ve even defined the problem.
The reality is that lighting is only the most visible DC load in a modern building.
Network switches. Wireless access points. Security cameras. Sensors. Building controls. Shades. Access control systems. Telecommunications equipment. Nearly every piece of modern electronics ultimately runs on DC power. In many ways, the question is not whether buildings use DC. They already do. The question is how efficiently we generate, distribute, manage, and protect it.
That is why I encourage facilities managers to think beyond individual lighting projects and start thinking about building infrastructure.
Instead of asking:
“Should we use PoE for lighting?”
Ask:
“What is the best way to distribute DC power throughout the building?”
Depending on the facility, the answer might be:
• Power over Ethernet (PoE)
• Class 4 Fault Managed Power Systems (FMPS)
• Centralized DC power distribution
• DC microgrids
• Hybrid fiber and power architectures
Each approach has strengths, limitations, and use cases.
When I recommend that facilities managers begin their transition to DC-powered lighting systems, I am not advocating for a particular product or vendor. I am advocating for a shift in design philosophy.
The future building is increasingly a DC-powered building.
Lighting is simply one of the easiest places to start the conversation because nearly every LED fixture already converts AC power to DC internally. Once you recognize that reality, it becomes much easier to see the larger opportunity: creating a building-wide DC infrastructure capable of supporting lighting, communications, security, automation, operational technology, distributed energy resources, battery storage, and resilient microgrids on a common power architecture.
Don’t start by asking, “Should we use PoE?”
Start by asking, “What’s the best way to deliver DC power to the growing number of devices in our building that already run on DC?”
PoE may be the answer.
But it shouldn’t be the assumption.
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