LED vs Halogen: Why LED Wins Every Time

If you're still using halogen bulbs anywhere in your home, you're spending more money than you need to. The case for LED over halogen is overwhelming — on energy, lifespan, safety, and increasingly on light quality too. This guide covers the comparison in full, so you can make an informed decision.

The Short Version

LED bulbs use 80–90% less energy than equivalent halogen bulbs, last 15–25 times longer, run significantly cooler, and now produce light that's indistinguishable from halogen in most applications. The upfront cost of LED is higher, but the payback period is typically less than a year for bulbs in regular use. After payback, you're saving money every day they're switched on.

Energy Consumption

This is where the difference is most stark. A halogen bulb producing 800 lumens (equivalent to an old 60W incandescent) uses around 42–52W of power. An LED producing the same 800 lumens uses 8–10W.

Run that through a year of typical household use:

• Halogen (50W, 3 hours/day): approximately 55kWh per year per bulb
• LED (8W, 3 hours/day): approximately 9kWh per year per bulb

At current UK energy prices, that's a saving of roughly £12–15 per bulb per year. In a home with 20 bulbs, switching from halogen to LED saves £240–300 per year on electricity alone.

Lifespan

Halogen bulbs typically last 2,000–3,000 hours. LED bulbs are rated at 15,000–25,000 hours — sometimes more.

At 3 hours of use per day:

• Halogen: replacement every 2–2.5 years
• LED: replacement every 14–23 years

The cost of replacement bulbs is a real consideration, especially in fittings with multiple bulbs (chandeliers, bathroom mirror lights, kitchen downlights). The long lifespan of LED effectively eliminates the ongoing bulb replacement cost that halogen creates.

Heat Output

Halogen bulbs convert only around 10–15% of their energy into visible light. The rest becomes heat — which is why halogen bulbs get too hot to touch within seconds of being switched on.

That heat has several implications:

• Safety: halogen bulbs are a fire risk if they come into contact with flammable materials, including certain lampshades and nearby fabric. This is a genuine safety concern, particularly in children's rooms
• Air conditioning load: in rooms that are air conditioned in summer, halogen bulbs actively add to the cooling load — you're paying to heat the room and then paying again to cool it
• Discomfort: in desk lamps and task lights, halogen bulbs create noticeable warmth that LED does not

LED bulbs run cool to the touch within seconds of switching off, and warm (not hot) during use. For children's rooms and bedrooms, this is a significant safety advantage.

Light Quality — The One Area Where Halogen Used to Win

For years, the main argument for halogen over LED was light quality. Halogen produces a warm, continuous spectrum of light with excellent colour rendering (CRI 100) — colours look accurate and natural under halogen in a way that early LED bulbs couldn't replicate.

That argument has largely expired. Modern LED bulbs achieve CRI 90+ routinely, and CRI 95+ products are widely available. At CRI 90+, the difference in colour rendering between LED and halogen is imperceptible to most people in normal conditions.

The remaining area where halogen still has an edge is in dimmability — halogen dims smoothly from full brightness to a very low glow without flickering. LED dimming has improved significantly but still varies by product and dimmer switch compatibility. Choosing a quality dimmable LED with a compatible dimmer eliminates this issue in practice.

Colour Temperature

Unlike halogen (which is fixed at around 2800–3000K — warm white), LED is available across a wide range of colour temperatures:

• Warm white (2700–3000K): closest to halogen, suitable for living rooms, bedrooms, and anywhere you want a cosy, relaxed atmosphere
• Natural white (3500–4000K): clean and neutral, good for kitchens, bathrooms, and home offices
• Cool white (5000K+): bright and energising, suited to workshops and utility areas

For most living spaces, warm white LED (2700–3000K) is the direct halogen replacement. If you want to replicate the exact quality of halogen light, look for warm white LED at 2700K with a CRI of 90 or above.

The Cost Comparison

LED bulbs cost more upfront — typically £2–8 per bulb versus £1–2 for halogen. But the running cost tells the real story:

The payback period for switching from halogen to LED is typically 6–12 months for bulbs in regular use. After that, every day is a saving.

Should You Switch All at Once or Gradually?

If you're replacing a blown halogen bulb, always replace it with an LED equivalent. If you have a house full of working halogen bulbs, the decision depends on your energy costs and tolerance for disruption. For high-use fittings — kitchen downlights, living room ceiling lights, desk lamps — switching immediately makes financial sense. For rarely-used fittings in cupboards and utility areas, waiting for the halogen to fail is reasonable.

One practical note: if you're replacing halogen in a dimmer-controlled fitting, check that your dimmer switch is LED-compatible. Many older dimmer switches designed for halogen will flicker or buzz with LED. A compatible LED dimmer switch (readily available and inexpensive) solves this immediately.

All of our lighting — from ceiling lights and chandeliers to children's lighting and outdoor fittings — uses LED throughout. Free UK delivery.