Question 1

How many lumens should an LED bulb have?

Accepted Answer

The required luminous flux depends on the application and the size of the space. An auxiliary lamp will often work well with 400–500 lm, while general lighting usually requires between 800 and 1,500 lm or more. These figures do not correspond directly to lux, because the actual illuminance on a surface depends on distance, beam angle, the position of the fitting and the reflective conditions of the surrounding environment.

Question 2

What LED wattage is equivalent to a conventional bulb?

Accepted Answer

There is no exact watt-for-watt equivalent because lumens are the key factor. A 6–8 W LED bulb typically produces around 700–800 lm, approximately equivalent to a 60 W incandescent bulb, although the visual result may vary depending on the optics and light distribution.

Question 3

How long does an LED bulb last?

Accepted Answer

Service life can range from 15,000 to more than 50,000 hours depending on quality and design, but it also depends on factors such as operating temperature, ventilation, switching cycles and the internal electronics. Under average conditions of use at four hours per day, 25,000 hours is equivalent to more than 17 years, although enclosed or poorly ventilated environments can significantly reduce this lifespan.

Question 4

What colour temperature should I choose?

Accepted Answer

2700–3000 K is recommended for warm environments such as living rooms or bedrooms, while 4000 K is common in kitchens, offices and retail spaces because of its neutral white light. Above 5000 K, the light becomes cooler and is useful in technical environments. Colour temperature does not affect the quantity of light emitted, only how that light is perceived.

Question 5

Can an LED bulb flicker?

Accepted Answer

Yes. Flickering can be caused by low-quality drivers, incompatibility with dimmers, unsuitable transformers or residual current in the installation. It is especially common when replacing halogen lamps if the dimmer or transformer is not designed for the low load of LED technology.

Question 6

Can LED bulbs be installed in enclosed light fittings?

Accepted Answer

Only if the model is designed for this purpose and there is enough space to dissipate heat. Although LEDs produce less heat than many other technologies, their electronics are sensitive to overheating, which can shorten their service life in poorly ventilated fittings.

Question 7

What CRI is recommended for an LED bulb?

Accepted Answer

A CRI above 80 is suitable for general lighting, while values above 90 are recommended when colour accuracy is important. This index does not measure the quantity of light but rather how accurately colours are reproduced under the light source.

Question 8

Does frequent switching reduce LED lifespan?

Accepted Answer

LEDs tolerate frequent switching very well and perform significantly better in this respect than fluorescent lamps, which are more affected by repeated on/off cycles.

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