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The UV-C LED Reality Check
254nm Mercury Lamp VS. 265nm LEDs - A Head-To-Head Comparison
4/14/2026



Why a Simple "Bulb Swap" to UV-C LEDs is a Costly Trap:
Anticipating a likely phase-out of traditional germicidal mercury lamps, the market is rushing toward UV-C LEDs. It’s easy to buy into the hype.
But what happens when you match them watt-for-watt in a real system?
In our latest Engineering Lens, we bypassed the marketing and looked at the physics. We compared a traditional 254nm mercury lamp against a 265nm LED array, demanding the exact same outcome: 25W of UV-C output in a Laminar Air Flow bench.
The results of replacing just one traditional bulb:
- Hardware Explosion: 1 Bulb 🆚 ~220 LEDs
- Thermal Crisis: 50W of wasted heat 🆚 >400W of wasted heat for LED
- Budget Blowout: ~800€ system cost 🆚 ~8,000€ system cost for LEDs
The Verdict: UV-C LEDs are not viable for typical, large-scale surface germicidal applications today.
They belong in low-flow, close-proximity setups.
Before you invest heavy capital into an LED architecture, you need to understand the true system-wide impacts.
Click the infographic below for the raw head-to-head data.
As always, if you are facing a unique decontamination or efficiency challenge, just reach out to contact@miranova.tech to know more, and discuss further this topic!

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2150 Nordhavn, Denmark
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