LED Lighting: Low Power Promise… but What About Lifetime?

The transition to LED lighting has been one of the quiet success stories of the energy transition. Homes and businesses have slashed lighting energy consumption by 70–90%, reduced maintenance cycles, and improved lighting quality. On paper, LED technology promises lifetimes of 25,000 to 50,000 hours—effectively “fit and forget.”

But in practice, many users will recognise a different reality: LEDs often fail far earlier than expected.

The question is—why?

The Truth About LED Lifetimes

The LED itself is rarely the problem.

Light Emitting Diodes are solid-state devices. When supplied with the correct current and voltage, they degrade very slowly. In controlled conditions, they can indeed last tens of thousands of hours.

The weak point is almost always the driver—the small power electronics embedded inside the bulb or fitting.

To operate an LED, we must convert:

• 230–240V AC mains
• into low-voltage DC (typically 12V, 24V, or even lower)

This conversion happens in a compact electronic circuit squeezed into the base of the lamp.

And that’s where things start to break down.

The Hidden Failure Point: Power Electronics

 Inside every LED bulb is a miniature power supply. It includes:

• Capacitors (which degrade over time)
• Rectifiers and switching components
• Heat-sensitive electronics in a confined space

Unlike the LED chip, these components:

• Age thermally
• Are sensitive to voltage fluctuations
• Struggle in confined, poorly ventilated housings

In essence, we’ve taken something that wants to last decades and paired it with something that may only last a few years.

And crucially:

Higher price does not guarantee longer life.

Many premium bulbs still use similar compact driver designs. The limitation is physical space and thermal management—not just component quality.

Environmental Reality: Where LEDs Struggle

Traditional lighting technologies—incandescent and halogen—were remarkably robust:

• No electronics
• High tolerance to heat and cold
• Minimal sensitivity to damp or vibration

LEDs, by contrast, are far more environment-dependent.

In real-world business settings:

• Cold stores
• Industrial units
• Outdoor fittings
• Damp plant rooms

…the electronics become the limiting factor.

Without appropriate:

• IP ratings
• Sealed enclosures
• Thermal management

…the driver fails long before the LED.

A Different Way of Thinking: Centralised DC Lighting

This raises an interesting engineering question:

Are we solving the problem in the wrong place?

Instead of placing a tiny, failure-prone power converter inside every bulb, what if we moved that function elsewhere?

The Concept:

• Convert AC to DC once, centrally
• Distribute low-voltage DC (e.g. 12V or 24V) around the building
• Power LED fittings directly, without individual drivers

What This Could Look Like

A centralised system could:

• Sit alongside the main distribution board
• Use a single, high-quality power conversion unit
• Be designed for:
  • Long life (20+ years)
  • Proper cooling
  • Maintainability and replacement

From there:

• Existing lighting circuits (often already separated) could potentially be reused or adapted
• Fixtures become simpler—essentially just LEDs, not electronics

The Benefits

1. Reliability

Remove the weakest link (distributed drivers), and lifetime becomes far more predictable.

2. Lower Cost Over Time

• Cheaper light fittings
• Fewer replacements
• Reduced maintenance disruption

3. True LED Lifetimes

Finally align real-world performance with the theoretical lifespan of LEDs.

4. Energy Efficiency

Centralised power supplies can be:

• More efficient
• Better regulated
• Easier to integrate with renewables and battery storage

The Challenges

This isn’t without barriers:

• Standards and regulations (AC wiring is deeply embedded in building design)
• Voltage drop considerations over longer DC runs
• Installer familiarity
• Upfront retrofit cost

And importantly, the lighting market is built around:

“Replace the bulb, not the system.”

Where This Already Exists

Interestingly, elements of this approach already appear in:

• Data centres (DC systems)
• Emergency lighting systems
• Off-grid and solar installations
• LED strip and architectural lighting

But it hasn’t yet become mainstream in general building lighting.

A Question for the Next Phase of Net Zero

We’ve made huge gains by switching to LED lighting—but we may have optimised for ease of replacement, not system longevity.

As businesses become more focused on:

• Whole-life cost
• Maintenance reduction
• Carbon impact of materials and replacements

…it may be time to rethink lighting infrastructure itself.

Final Thought

LEDs delivered on their promise of low energy.

But the promise of long life?

That depends less on the LED—and more on where we choose to put the electronics.

Perhaps the next evolution of lighting isn’t a better bulb…
but a better system.

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