Do LED bulbs fail too soon? What can reduce their lifespan
Do LED bulbs fail too soon? What can reduce their lifespan
LED bulbs are known for their efficiency and long lifespan. However, some may begin to flicker, lose brightness or stop working sooner than expected.
This does not necessarily mean there is a problem with LED technology. The actual lifespan depends on the quality of the product, the installation conditions and how the bulb is used.
What do the lifespan hours mean?
LED bulb packaging may display values such as 15,000, 25,000 or 50,000 hours. These figures are estimates obtained under specific operating conditions, not a guarantee that every bulb will last exactly that long.
To understand these figures more easily, consider the number of hours the bulb is used each day. A bulb with a stated lifespan of 25,000 hours could theoretically last:
around 13 years when used for 5 hours a day;
around 7 years when used for 10 hours a day;
just under 3 years when left on continuously.
In practice, heat, the electrical installation, ambient temperature and the number of times the bulb is switched on and off can all affect its lifespan.
An LED bulb does not always stop working suddenly. In many cases, it gradually loses brightness. The L70 rating found on some datasheets refers to the estimated period until the product produces approximately 70% of its initial light output. The bulb may therefore reach its stated lifespan and remain operational, although it will produce less light than when it was new.
The stated lifespan should not be confused with the warranty. Lifespan is a technical estimate of operating time, while the warranty is the period during which the manufacturer provides repair or replacement under specified conditions.
The actual lifespan will always depend on the conditions of use, the quality of the installation and the characteristics of the product itself.
Example of lifespan information provided in a datasheet.
Heat is one of the main causes of wear
Although an LED bulb produces less heat than a traditional bulb, its electronic components still generate heat.
When installed in a very enclosed or poorly ventilated light fitting, this heat can build up and accelerate wear. For this reason, not every bulb is suitable for use in a fully enclosed fitting.
The temperature of the surrounding space should also be considered. Very hot environments, such as areas near ovens, machinery or roofs exposed to direct sunlight, require products designed for those conditions.
Before installation, check the packaging or datasheet to confirm the operating temperature and whether the bulb is suitable for enclosed fittings.
The LED itself is not always the cause
Inside an LED bulb is a small electronic circuit that converts and regulates the power required by the LEDs. Many premature failures occur in this circuit rather than in the LEDs themselves.
In light fittings with a separate driver, the problem may also be caused by the driver. Incorrect current, high temperatures or incompatible equipment can affect the performance and lifespan of the entire system.
Voltage fluctuations, poor connections and loose contacts can cause flickering and place additional strain on the components. If several bulbs repeatedly fail in the same location, the electrical installation should be checked by a qualified professional.
It is also important to pay attention to dimmer switches. A bulb should only be dimmed when it is identified as dimmable and is used with a compatible dimmer. An unsuitable combination may cause noise, flickering or irregular operation, or prevent the bulb from switching off completely.
For low-voltage bulbs, compatibility with the existing transformer or driver should also be confirmed.
Does switching a bulb on and off reduce its lifespan?
Modern LED bulbs can usually withstand a large number of operating cycles. Switching the light on and off during normal use is not generally the main cause of failure.
Even so, each model has an expected number of switching cycles, which may be shown on the packaging or datasheet. In areas where lighting is frequently activated by sensors, it is advisable to choose products designed for frequent switching.
What should you check before buying?
Do not choose a bulb based only on its shape or wattage. Check the voltage, lamp cap, lumens, colour temperature and beam angle. You should also confirm whether dimming is required and whether the product is suitable for an enclosed fitting or unusual temperature conditions.
A complete datasheet makes it easier to compare products and choose a suitable solution for the installation.
If bulbs installed in the same light fitting have a short lifespan, flicker or become excessively hot, there may be a problem with the fitting or the electrical installation.
Switch off the power supply if you notice a burning smell, signs of overheating or damaged connections, and ask a qualified professional to inspect the installation.
If you need help choosing a suitable bulb, send us the reference of the old product and, if possible, a photograph of the light fitting.
